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Mill, SC (Charlotte, NC) [Member] Lebanon, TN (Nashville) [Member] Rockford, IL (Sherwin-Williams Co.) [Member] Edinburg, TX [Member] Corpus Christi, TX [Member] Halfmoon, NY (Albany) [Member] Lebanon, OH (Cincinnati) [Member] Olive Branch, MS (Memphis, TN)(Anda Pharmaceuticals, Inc.) 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(Cincinnati) [Member] Tulsa [Member] Altoona [Member] Imperial (Pittsburgh) [Member] Monaca (Pittsburgh) [Member] Ft. Mill (Charlotte, NC) [Member] Hanahan (Charleston) (SAIC) [Member] Hanahan (Charleston) (FDX Ground) [Member] Chattanooga [Member] Lebanon (Nashville) [Member] Memphis [Member] Shelby County [Member] Carrollton (Dallas) [Member] Corpus Christi [Member] Edinburg [Member] El Paso [Member] Houston [Member] Lindale (Tyler) [Member] Spring (Houston) [Member] Waco [Member] Charlottesville [Member] Roanoke (FDX Ground) [Member] Burlington (Seattle/Everett) [Member] Cudahy (Milwaukee) [Member] Green Bay [Member] White Bear Lake (Minneapolis/St. Paul) [Member] Business Acquisition [Axis] Charlotte Metropolitan Statistical Area [Member] Concord, NC [Member] New Orleans MSA [Member] Covington, LA [Member] Pittsburgh MSA [Member] Imperial, PA [Member] Seattle/Everett MSA [Member] Burlington, WA [Member] Colorado Springs, CO [Member] Louisville, KY [Member] Orlando MSA [Member] Davenport, FL [Member] Kansas City MSA [Member] Olathe, KS [Member] Olive Branch, MS [Member] Tampa, FL [Member] Huntsville, AL [Member] Monroe, NC [Member] Scenario [Axis] Pro Forma [Member] Fdx [Member] FDX and Subsidiaries [Member] Concentration Risk Type [Axis] Lease Concentration Risk [Member] Milwaukee Electric Tool Corporation [Member] ULTA, Inc. 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(Cincinnati), OH [Member] Richmond, VA [Member] St. Joseph, MO [Member] Newington (Hartford), CT [Member] Cudahy (Milwaukee), WI [Member] Beltsville (Washington DC), MD [Member] Granite City (St. Louis, MO), IL [Member] Winston-Salem, NC [Member] Elgin (Chicago), IL [Member] Tolleson (Phoenix), AZ [Member] Edwardsville (Kansas City), KS (Carlisle Tire) [Member] Tampa, FL (FDX) [Member] Denver, CO [Member] Hanahan (Charleston), SC (SAIC) [Member] Hanahan (Charleston), SC (FDX Ground) [Member] Augusta, GA (FDX Ground) [Member] Huntsville, AL [Member] Richfield (Cleveland), OH [Member] Tampa, FL (FDX) [Member] Griffin (Atlanta), GA [Member] Orion, MI [Member] Carlstadt (New York, NY) , NJ [Member] Wheeling (Chicago), IL [Member] Cheektowaga (Buffalo),NY [Member] Richmond, VA [Member] Montgomery (Chicago), IL [Member] Tampa, FL (Tampa Bay Grand Prix) [Member] Lakeland, FL [Member] El Paso, TX [Member] Chattanooga, TN [Member] Bedford Heights (Cleveland), OH [Member] Punta Gorda, FL [Member] Cocoa, FL [Member] Orlando, FL [Member] Topeka, KS [Member] Memphis, TN [Member] Houston, TX [Member] Carrollton (Dallas), TX [Member] Ft. Mill (Charlotte, NC), SC [Member] Lebanon (Nashville), TN [Member] Rockford, IL (Sherwin-Williams Co.) [Member] Edinburg, TX [Member] Streetsboro (Cleveland), OH [Member] Corpus Christi, TX [Member] Halfmoon (Albany), NY [Member] Lebanon (Cincinnati), OH [Member] Olive Branch (Memphis, TN), MS (AndaPharmaceuticals Inc.) [Member] Oklahoma City, OK (FDX Ground) [Member] Waco, TX [Member] Olive Branch (Memphis, TN), MS (Milwaukee Tool) [Member] Green Bay, WI [Member] Stewartville (Rochester), MN [Member] Tulsa, OK [Member] Buckner (Louisville), KY [Member] Edwardsville (Kansas City), KS (Carlisle Tire) [Member] Altoona, PA [Member] Spring (Houston), TX [Member] Indianapolis, IN (FDX Ground) [Member] Sauget (St. Louis, MO), IL [Member] Lindale (Tyler), TX [Member] Kansas City, MO (Bunzl) [Member] Frankfort (Lexington), KY [Member] Jacksonville, FL (FDX Ground) [Member] Monroe (Cincinnati), OH [Member] Greenwood (Indianapolis), IN [Member] Ft. Worth (Dallas), TX [Member] Rockford, IL (Collins Aerospace Systems) [Member] Concord (Charlotte), NC [Member] Covington (New Orleans), LA [Member] Imperial (Pittsburgh), PA [Member] Burlington (Seattle/Everett), WA [Member] Davenport (Orlando), FL [Member] Olathe (Kansas City), KS [Member] Shopping Center [Member] Somerset, NJ [Member] Vacant Land [Member] Roanoke, VA (DHL) [Member] Ridgeland (Jackson), MS [Member] Richland (Jackson), MS [Member] Richmond, VA (FDX) [Member] Industrial Building [Member] Wheeling (Chicago), IL [Member] Cheektowaga (Buffalo), NY [Member] Richmond, VA (Carrier) [Member] Montgomery (Chicago), IL [Member] Augusta, GA (FDX) [Member] Lakeland, FL [Member] Bedford Heights (Cleveland), OH [Member] Carrollton (Dallas), TX [Member] Ft. Mill (Charlotte, NC), SC [Member] Lebanon (Nashville), TN [Member] Rockford, IL (Sherwin-Williams) [Member] Streetsboro (Cleveland), OH [Member] Halfmoon (Albany), NY [Member] Olive Branch (Memphis, TN), MS (Anda Pharmaceuticals Inc. ) [Member] Livonia (Detroit), MI [Member] Buckner (Louisville), KY [Member] Edwardsville (Kansas City), KS (International Paper) [Member] Spring (Houston), TX [Member] Indianapolis, IN (FDX Ground) [Member] Sauget (St. Louis, MO), IL [Member] Frankfort (Lexington), KY [Member] Monroe (Cincinnati), OH [Member] Ft. Worth (Dallas), TX [Member] Rockford, IL (Collins Aerospace Systems) [Member] Somerset, NJ [Member] Name of Property [Axis] Monaca (Pittsburgh), PA [Member] Orangeburg (New York), NY [Member] Urbandale (Des Moines), IA [Member] O'Fallon (St. Louis), MO [Member] Schaumburg (Chicago), IL [Member] Burr Ridge (Chicago), IL [Member] Romulus (Detroit), MI [Member] Liberty (Kansas City), MO [Member] Omaha, NE [Member] Charlottesville, VA [Member] West Chester Twp (Cincinnati), OH [Member] St. Joseph, MO [Member] Newington (Hartford), CT [Member] Cudahy (Milwaukee), WI [Member] Beltsville (Washington, DC), MD [Member] Granite City (St. Louis, MO), IL [Member] Winston Salem, NC [Member] Elgin (Chicago), IL [Member] Tolleson (Phoenix), AZ [Member] Ft. Myers, FL (Vacant) [Member] Edwardsville (Kansas City), KS (Carlisle) [Member] Hanahan (Charleston), SC (SAIC) [Member] Hanahan (Charleston), SC (FDX Ground) [Member] Richfield (Cleveland), OH [Member] Griffin (Atlanta), GA [Member] Roanoke, VA (CHEP USA) [Member] Tampa, FL (Tampa Bay Grand Prix) [Member] Rockford, IL (Sherwin-Williams Co.) [Member] Oklahoma City, OK (FDX Ground) [Member] Property, Plant and Equipment, Type [Axis] Building [Member] FDX And Subsidiaries And Milwaukee Electric Tool Corporation [Member] Rental And Reimbursement Revenue [Member] Lease Agreement [Member] Vice President of Investor Relations [Member] Property Purchase Agreement [Member] Mortgage Loan Subsequently Fiscal Yearend [Member] Security One [Member] Security Three [Member] Franklin Street Properties [Member] VEREIT, Inc. [Member] Washington Prime Group, Inc [Member] Short-term Debt, Type [Axis] Oklahoma City, OK (Bunzl) [Member] Greenwood, IN [Member] Ft. Worth, TX [Member] Hamburg, NY (Buffalo) [Member] Ft. Myers, FL [Member] Walker, MI [Member] Mesquite, TX (Dallas) [Member] Aiken, SC (Augusta, GA) [Member] Homestead, FL (Miami) [Member] Concord, NC (Charlotte) One [Member] Kenton, OH [Member] Stow, OH [Member] Hamburg, NY [Member] Ft. Myers, FL (FDX Ground) [Member] Walker, MI (Grand Rapids) [Member] Oklahoma City, OK (Bunzl Distribution Oklahoma, Inc.) [Member] Stock Option Eight [Member] Ft. Myers (Vacant) [Member] Ft. Myers (FDX Ground) [Member] Homestead (Miami) [Member] Rockford (Sherwin-Williams Co.) [Member] Olive Branch (Memphis, TN) (Anda Pharmaceuticals, Inc.) [Member] Hamburg (Buffalo) [Member] Concord (Charlotte) [Member] Kenton [Member] Stow [Member] Oklahoma City (FDX Ground)[Member] Oklahoma City (Bunzl) [Member] Aiken (Augusta, GA) [Member] Ft. Worth (Dallas) [Member] Mesquite (Dallas) [Member] Mechanicsville (Richmond) [Member] Richmond [Member] Roanoke (CHEP USA) [Member] Rockford (Collins Aerospace Systems) [Member] Walker (Grand Rapids) [Member] Mesquite, TX [Member] Aiken, SC [Member] Homestead, FL [Member] Kansas City, MO (Kellogg) [Member] Orangeburg NY [Member] Orangeburg NY (Kellogg) [Member] Ft. Myers, FL [Member] Land [Member] In-Place Leases [Member] Fedex Ground Package System Inc. [Member] Fiscal Year 2018 [Member] Fiscal Year 2019 [Member] Fiscal Year 2020 [Member] Fiscal Year 2021 [Member] Fiscal Year 2022 [Member] Building Improvements [Member] Tenant Improvements [Member] Hamburg (Buffalo), NY [Member] Walker (Grand Rapids), MI [Member] Mesquite (Dallas), TX [Member] Aiken (Augusta, GA), SC [Member] Homestead (Miami), FL [Member] Concord (Charlotte), NC One [Member] Real Estate Held for Sale [Member] Industrial Buildings ,Shopping Center and Vacant Land [Member] Mechanicsville (Richmond), VA (FDX) [Member] Hamburg (Buffalo), NY [Member] Concord (Charlotte), NC 1 [Member] Amended and Restated 2007 Incentive Award Plan [Member] Non-Employee Directors [Member] Board of Directors [Member] October 2, 2017 [Member] Series C Cumulative Redeemable Preferred Stock [Member] Preferred Stock ATM Program [Member] Subsidiaries [Member] Subsequent Event Type [Axis] Subsequent Event [Member] Charleston, SC [Member] Underwritten Public Offering [Member] At-The-Market Offerings [Member] Lease Arrangement, Type [Axis] Five Lease [Member] Adjustments for New Accounting Pronouncements [Axis] Accounting Standards Update 2015-03 [Member] White Bear Lake (Minneapolis/St. Paul), MN [Member] Kansas City, MO (Kellogg) [Member] Orangeburg NY [Member] Monroe, NC [Member] White Bear Lake (Minneapolis/St. Paul), MN [Member] Acquired in-place Leases [Member] New Buildings [Member] Marcus Assosiates [Member] Tampa (FDX) [Member] Covington, LA [Member] Document and Entity Information [Abstract] Entity Registrant Name Entity Central Index Key Document Type Document Period End Date Amendment Flag Current Fiscal Year End Date Entity Well-Known Seasoned Issuer Entity Voluntary Filers Entity Current Reporting Status Entity Filer Category Entity Public Float Entity Common Stock, Shares Outstanding Trading Symbol Document Fiscal Period Focus Document Fiscal Year Focus Statement [Table] Statement [Line Items] Class of Stock [Axis] ASSETS Real Estate Investments: Land Buildings and Improvements Total Real Estate Investments Accumulated Depreciation Real Estate Investments Real Estate Held for Sale Cash and Cash Equivalents Securities Available for Sale at Fair Value Tenant and Other Receivables Deferred Rent Receivable Prepaid Expenses Intangible Assets, net of Accumulated Amortization of $13,404,318 and $12,332,599, respectively Capitalized Lease Costs, net of Accumulated Amortization of $3,393,187 and $3,238,516, respectively Financing Costs, net of Accumulated Amortization of $619,555 and $246,678, respectively Other Assets TOTAL ASSETS LIABILITIES AND SHAREHOLDERS' EQUITY Liabilities: Fixed Rate Mortgage Notes Payable, net of Unamortized Debt Issuance Costs Loans Payable Accounts Payable and Accrued Expenses Other Liabilities Preferred Stock Called for Redemption Total Liabilities COMMITMENTS AND CONTINGENCIES Shareholders' Equity: Preferred stock, value Common Stock, $0.01 Par Value Per Share: 192,039,750 and 194,600,000 Shares Authorized as of September 30, 2017 and 2016, respectively; 75,630,521 and 68,920,972 Shares Issued and Outstanding as of September 30, 2017 and 2016, respectively Excess Stock, $0.01 Par Value Per Share: 200,000,000 Shares Authorized as of September 30, 2017 and 2016; No Shares Issued or Outstanding as of September 30, 2017 and 2016 Additional Paid-In Capital Accumulated Other Comprehensive Income Undistributed Income Total Shareholders' Equity TOTAL LIABILITIES & SHAREHOLDERS' EQUITY Accumulated amortization of intangible assets Accumulated amortization of lease costs Accumulated amortization of financing costs Cumulative redeemable preferred, stock dividend rate Preferred stock, par value Preferred stock, shares authorized Preferred stock, shares issued Preferred stock, shares outstanding Common stock, par value Common Stock, shares authorized Common Stock, shares issued Common Stock, shares outstanding Excess Stock, par value Excess Stock , shares authorized Excess Stock , shares issued Excess Stock , shares outstanding Income Statement [Abstract] INCOME: Rental Revenue Reimbursement Revenue Lease Termination Income TOTAL INCOME EXPENSES: Real Estate Taxes Operating Expenses General and Administrative Expenses Acquisition Costs Depreciation Amortization of Capitalized Lease Costs and Intangible Assets TOTAL EXPENSES OTHER INCOME (EXPENSE): Dividend and Interest Income Gain on Sale of Securities Transactions, net Interest Expense, including Amortization of Financing Costs TOTAL OTHER INCOME (EXPENSE) INCOME FROM CONTINUING OPERATIONS Gain on Sale of Real Estate Investment NET INCOME Less: Preferred Dividends Less: Redemption of Preferred Stock NET INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS BASIC INCOME – PER SHARE Net Income Less: Preferred Dividends Less: Redemption of Preferred Stock Net Income Attributable to Common Shareholders – Basic DILUTED INCOME – PER SHARE Net Income Less: Preferred Dividends Less: Redemption of Preferred Stock Net Income Attributable to Common Shareholders – Diluted WEIGHTED AVERAGE COMMON SHARES OUTSTANDING Basic Diluted Statement of Comprehensive Income [Abstract] Net Income Other Comprehensive Income: Unrealized Holding Gains (Losses) Arising During the Period Reclassification Adjustment for Net Gains of Sales of Securities Transactions Realized in Income Total Comprehensive Income Comprehensive Income Attributable to Common Shareholders Balance Beginning Shares Issued in Connection with the DRIP Shares Issued in Connection with Underwritten Public Offering of 6.125% Series C Preferred Stock, net of offering costs Shares Issued in Connection with At-The-Market Offerings of 6.125% Series C Preferred Stock, net of offering costs Shares Issued Through the Exercise of Stock Options Shares Issued Through Restricted Stock Awards Stock Compensation Expense Distributions To Common Shareholders Preferred Dividends Change in Unrealized Net Holding Gain (Loss) on Securities Available for Sale, Net of Reclassification Adjustment Preferred Stock Called for Redemption Cancellation of Shares Related to Forfeiture of Restricted Stock Awards Balance Ending Preferred, stock dividend rate Statement of Cash Flows [Abstract] CASH FLOWS FROM OPERATING ACTIVITIES Noncash Items Included in Net Income: Depreciation & Amortization Stock Compensation Expense Deferred Straight Line Rent Gain on Sale of Securities Transactions, net Loss (Gain) on Sale of Real Estate Investments Changes in: Tenant & Other Receivables Prepaid Expenses Other Assets & Capitalized Lease Costs Accounts Payable, Accrued Expenses & Other Liabilities NET CASH PROVIDED BY OPERATING ACTIVITIES CASH FLOWS FROM INVESTING ACTIVITIES Purchase of Real Estate & Intangible Assets Capital Improvements Proceeds on Sale of Real Estate Return of Deposits on Real Estate Deposits Paid on Acquisitions of Real Estate Proceeds from Sale of Securities Available for Sale Purchase of Securities Available for Sale NET CASH USED IN INVESTING ACTIVITIES CASH FLOWS FROM FINANCING ACTIVITIES Proceeds from Fixed Rate Mortgage Notes Payable Principal Payments on Fixed Rate Mortgage Notes Payable Net Proceeds (Repayments) from Loans Payable Financing Costs Paid on Debt Redemption of 7.625% Series A Preferred Stock Redemption of 7.875% Series B Preferred Stock Proceeds from Underwritten Public Offering of 6.125% Series C Preferred Stock, net of offering costs Proceeds from At-The-Market Preferred Equity Program, net of offering costs Proceeds from Issuance of Common Stock in the DRIP, net of Dividend Reinvestments Proceeds from the Exercise of Stock Options Preferred Dividends Paid Common Dividends Paid, net of Reinvestments NET CASH PROVIDED BY FINANCING ACTIVITIES Net Increase (Decrease) in Cash and Cash Equivalents Cash and Cash Equivalents at Beginning of Year CASH AND CASH EQUIVALENTS AT END OF YEAR Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization and Summary of Significant Accounting Policies Real Estate [Abstract] Real Estate Investments Business Combinations [Abstract] Acquisitions, Expansions and Disposition Goodwill and Intangible Assets Disclosure [Abstract] Intangible Assets Risks and Uncertainties [Abstract] Significant Concentrations of Credit Risk Investments, Debt and Equity Securities [Abstract] Securities Available for Sale Debt Disclosure [Abstract] Mortgage Notes and Loans Payable Other Liabilities Disclosure [Abstract] Other Liabilities Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Stock Compensation Plan Leases [Abstract] Income from Leases Related Party Transactions [Abstract] Related Party Transactions Income Tax Disclosure [Abstract] Taxes Equity [Abstract] Shareholders' Equity Fair Value Disclosures [Abstract] Fair Value Measurements Supplemental Cash Flow Elements [Abstract] Cash Flow Commitments and Contingencies Disclosure [Abstract] Contingencies, Commitments and Legal Matters Subsequent Events [Abstract] Subsequent Events Quarterly Financial Information Disclosure [Abstract] Selected Quarterly Financial Data (Unaudited) Real Estate And Accumulated Depreciation Real Estate and Accumulated Depreciation Description of the Business Segment Reporting & Financial Information Use of Estimates Principles of Consolidation and Non-controlling Interest Buildings and Improvements Gains (Losses) on Sale of Real Estate Acquisitions Marketable Securities Cash and Cash Equivalents Intangible Assets, Capitalized Lease Costs and Financing Costs Revenue Recognition Lease Termination Income Net Income Per Share Stock Compensation Plan Income Tax Comprehensive Income Reclassifications New Accounting Pronouncements Schedule of Real Estate Investments Summary of Purchase Price Allocation for Assets Acquisitions Summary of Operations Results for Properties Acquisition Schedule of Disposition and Real Estate Classified as Held for Sale Schedule of Pro Forma Information Schedule of Intangible Assets Under Leases in-place Acquisition Schedules of Concentration of Risk Schedule of Temporary Impaired Securities Summary of Range of Losses Schedule of Gain (loss) on Securities Transactions, Net Summary of Investments in Debt and Equity Securities Summary of Fixed Rate Mortgage Notes Payable Summary of Mortgage Notes Payable Schedule of Maturities of Long-term Debt Schedule of Other Liabilities Schedule of Stock Options, Valuation Assumptions Summary of Status of Company's Stock Option Plan Summary of Stock Options Outstanding Summary of Nonvested Restricted Stock Awards Schedule of Future Minimum Rental Payments for Operating Leases Schedule of Net Income and Taxable Income Schedule of Cash Dividends Paid and Dividends Paid Deduction Dividends Payable [Table] Dividends Payable [Line Items] Schedule of Shares Issued in Connection with Dividend Reinvestment and Stock Purchase Plan Summary of Cash Distributions to Common Shareholders Schedule of Dividend Declared and Paid on Preferred Stock Summary of Fair Value of Financial Assets Schedule of Selected Quarterly Financial Data Finite-Lived Intangible Assets by Major Class [Axis] Number of real estate properties owned REIT investment securities, description Majority ownership percentage owned Ownership percentage by noncontrolling owners Estimated useful life of buildings and improvements Fair value of security cost percentage Weighted-average amortization period upon acquisition for intangible assets Amortization expense related to deferred leasing and financing costs Amortization expense for existing assets in year 2018 Amortization expense for existing assets in year 2019 Amortization expense for existing assets in year 2020 Amortization expense for existing assets in year 2021 Amortization expense for existing assets in year 2022 Lease termination income description Total square foot of property Potential lease termination income Common stock equivalents included in the diluted weighted average shares outstanding Number of antidilutive options to purchase shares Stock based compensation expense Portion of income which is not taxable, description Percentage of taxable income Percentage of assets in real estate investments Reduction in fixed rate mortgage note payable liability Reclassification of amortization of financing costs Property Type Building & Improvements Accumulated Depreciation Net Book Value Purchase of industrial building Sale of industrial building Expansion of industrial building Size of industrial building Percentage of real estate property leased Proceeds from sale of real estate Contracted price Lease term Mortgage loan amortization period Lease expiration date after expansion Lease expiration prior to expansion Lease expiration date Purchase price of industrial building Mortgage loan amortization period Face amount of mortgages Face amount of mortgage prior to expansion Face amount of mortgage after expansion Mortgage loans on real estate, interest rate Amount being amortized into rental revenue related to the intangible assets Lease termination fees percentage Annual rental income over the remaining term of lease Gain on sale of real estate Expansion square feet Lease expiration date description Lease expiration date Lease expiration date change Cost of parking lot expansion Contracted price to sell Lease period Cost of parking expansion Increase in annual rent Rent prior to expansion Rent prior to expansion, per square foot Rent increase to after expansion Rent increase to after expansion, per square foot Annualized rent after expansion Square feet before expansion Size of building after expansion Intangible asset related to the lease in-place Lease on real estate terms Percentage of annual rent increase Annualized rent after expansion, per square foot Purchase price allocation of properties acquired Rental Revenue Net Income Rental and Reimbursement Revenue Real Estate Taxes Operating Expenses Depreciation & Amortization Interest Expense Income (Loss) from Operations Gain (Loss) on Sale of Real Estate Investment Net Income Rental Revenues Net Income Attributable to Common Shareholders Basic Net Income per Share Attributable to Common Shareholders Diluted Net Income per Share Attributable to Common Shareholders Amortization of intangible assets Amortization expense for existing intangible assets in year 2018 Amortization expense for existing intangible assets in year 2019 Amortization expense for existing intangible assets in year 2020 Amortization expense for existing intangible assets in year 2021 Amortization expense for existing intangible assets in year 2022 Rental revenue related to intangible assets Schedule of Real Estate Properties [Table] Real Estate Properties [Line Items] Total Intangible Assets, net Concentration Risk [Table] Concentration Risk [Line Items] Total property (in square feet) Concentration risk based on square feet, percentage Leases percentage of total property Description of total rentable space leased Percentage of marketable securities to undepreciated assets Rental and reimbursement revenue Securities available for sale at fair value Rental and reimbursement revenue, percentage Percentage of marketable securities to undepreciated assets, maximum percentage of ownership Net unrealized gain on securities portfolio Loan payable Dividend income on securities available for sale Interest income Proceeds from sales or redemptions of securities available for sale Less than 12 Months, Fair Value Less than 12 Months, Unrealized Losses 12 Months or Longer, Fair Value 12 Months or Longer, Unrealized Losses Number of Individual Securities Fair Value Unrealized Losses Range of Loss (Percentage) Gross realized gains Gross realized losses Gains on Sales of Securities Transactions, net Equity securities available for sale, Dividend Rate Equity securities available for sale, Number of Shares Equity securities available for sale, Cost Equity Securities available for sale, Estimated Market Value Modified Pass-Through Mortgage-Backed Securities, Interest Rate Modified Pass-Through Mortgage-Backed Securities, Number of Shares Modified Pass-Through Mortgage-Backed Securities, Cost Modified Pass-Through Mortgage-Backed Securities, Estimated Market Value Total Securities Available for Sale, Cost Total Securities Available for Sale, Estimated Market Value Mortgage loans on real estate, weighted average interest rate Weighted average loan maturity of mortgage notes payable Mortgage loans on real estate, new acquisitions Repayment of mortgage loan Line of credit facility, description Mortgage loan Aggregate purchase price of industrial properties Interest rate Mortgage loans on commitment, interest rate Old line of credit facility Amount available on old line of credit Additional amount available on the accordion feature on old line of credit facility Total amount available including the accordion on the line of credit facility Line of credit Percentage of capitalization rate Unsecured revolving line of credit, interest rate description Unsecured revolving line of credit, BMO interest rate description Unsecured revolving line of credit, interest rate description on current leverage ratio Loans payable Total loans payable Term loan Shares for secure loan Loan interest rate Percentage of amount available to borrow on margin Percentage of amount available to borrow on margin, interest rate Interest expense Fixed Rate Mortgage Notes Payable, Amount Weighted Average Interest Rate Debt Issuance Costs Accumulated Amortization of Debt Issuance Costs Unamortized Debt Issuance Costs Long-term Debt, Type [Axis] Fixed Rate Maturity date Mortgage Notes Payable 2018 2019 2020 2021 2022 Thereafter Total Rent paid in advance Unearned reimbursement revenue Tenant security deposits Other Total Common stock shares reserved for future issuance Extend the term of plan Stock based awards descripiton Maximum share based compensation award granted in value Percentage of common shares available under plan without minimum vesting period Stock option term Exercise price per common share percentage Number of options granted shares Fair value of option granted shares Vesting period of stock option Compensation expense Remaining unamortized stock option expenses Aggregate intrinsic value of options outstanding Intrinsic value of options exercised Options, Weighted average remaining contractual term Number of shares of restricted stock issued during the year Number of participants Grant date fair value of option granted Unrecognized restricted stock compensation related to outstanding non-vested restricted stock grants awarded Unrecognized restricted stock compensation remaining weighted average period Restricted Stock Compensation expense Shares available for grant as stock options Dividend yield Expected volatility Risk-free interest rate Expected lives (years) Estimated forfeitures Number of shares, Outstanding at beginning of year Number of shares, Granted Number of shares, Exercised Number of shares, Expired/Forfeited Number of shares, Outstanding at end of year Weighted Average Exercise Price, Outstanding at beginning of year Weighted Average Exercise Price, Granted Weighted Average Exercise Price, Exercised Weighted Average Exercise Price, Expired/Forfeited Weighted Average Exercise Price, Outstanding at end of year Exercisable at end of year Weighted-average fair value of options granted during the year Date of grant Number of grants Number of shares outstanding Option price Expiration date Non-vested, Shares, Beginning balance Non-vested, Shares, Granted Non-vested, Shares, Dividend reinvested shares Non-vested, Shares, Vested Non-vested, Shares, Forfeited Non-vested, Shares, Ending balance Non-vested, Weighted average grant date fair value, Beginning balance Non-vested, Weighted average grant date fair value, Granted Non-vested, Weighted average grant date fair value, Dividend reinvested shares Non-vested, Weighted average grant date fair value, Vested Non-vested, Weighted average grant date fair value, Forfeited Non-vested, Weighted average grant date fair value, Ending balance Weighted average lease maturity term 2018 2019 2020 2021 2022 thereafter Total UMH common stock shares purchased during the period UMH common stock value purchased during the period Weighted average price per share Number of shares purchased through UMH's dividend reinvestment UMH purchase of the company's common stock shares purchased during the period UMH purchase of the company's common stock value purchased during the period Number of full-time employees Number of part-time employee Percentage of Vice President of Investor Relation's salary allocate to company Percentage of salary allocate to UMH Net shared expenses billed from UMH Square feet of corporate office Corporate office rent expense Corporate office rent per square foot Ownership percentage by company Director's fees - Daniel D. Cronheim Mortgage brokerage commissions received by David Cronheim Mortgage Corporation Annual management fee Dividend requirement for estimated taxable income Net income applicable to common shareholders Book / tax difference on gains realized from capital transactions Stock compensation expense Deferred compensation Other book / tax differences, net Taxable income before adjustments Add: capital gains Estimated taxable income subject to 90% dividend requirement Cash dividends paid Less: Portion designated capital gains losses distribution Less: Return of capital Estimated dividends paid deduction Percentage of discount price from market price Through DRIP Program Percentage of increase in common stock dividend Dividend declared per share Annualized dividend rate per share Period of maintained or increased its cash dividend Declaration date Dividends payable, date to be paid Record date Preferred stock par value Preferred stock redemption price Preferred stock accrued dividend per share Redemption of preferred stock Series A Preferred Stock Dividend rate on preferred stock Series A Preferred Stock Accrued dividends Net Accrued Dividend Paid at Redemption Dividend per preferred stock Cash dividends paid Preferred shares redemption charges Offering price per share Net proceeds from public offering Proceeds from offering used to pay down line of credit Net proceeds from public offering used to Redeem Series A Preferred Stock Liquidation price per share Gross proceeds from offering Net proceeds from offering Proceeds from issuance of sale of equity Number of preferred stock shares sold Weighted average exercise price per share Aggregate liquidation preference Annual rate of dividends cumulative and payable Description of redemption of preferred stock outstanding Description of redemption of preferred stock outstanding upon the occurrence of Change of Control Maximum dollar value that may be purchased under the Share Repurchase Program Amounts received Less: Dividend reinvestments Amounts received, net Number of Shares Issued Cash distributions paid to common shareholders, Amount Cash distributions paid to common shareholders, Per Share Declaration Date Record Date Payment date Dividend Dividend per Share Fixed rate mortgage notes payable at fair value Fixed rate mortgage notes payable at carrying value Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Major Types of Debt and Equity Securities [Axis] Securities Available for Sale Cash paid for interest Amount of dividend reinvested Contingencies and Commitments [Table] Contingencies and Commitments [Line Items] Area of buildings Net lease maturity term Aggregate purchase price of industrial properties Area leased to investment grade tenant Percentage of building area leased to investment grade tenant Number of real estate properties committed to purchase Number of real estate properties committed to mortgage Mortgage Loans committed on real estate Mortgages, minimum interest rate Mortgages, maximum interest rate Mortgage loans weighted average interest rate Subsequent Event [Table] Subsequent Event [Line Items] Dividend payable date of record Area of land Purchase price of industrial building Mortgage loans on real estate, term of loan Face amount of mortgages Mortgage loans on real estate, interest rate Annual rental income over the remaining term of lease Cost of expansion Increase in rent from expansion Rent increased to after expansion Rent increased to expansion per square foot Rental and Reimbursement Revenue Total Expenses Other Income (Expense) Net Income Attributable to Common Shareholders Net Income Attributable to Common Shareholders per diluted share SEC Schedule III, Real Estate and Accumulated Depreciation, by Property [Table] SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] Property, plant and equipment, useful life Property, plant and equipment, estimated useful lives Encumbrances Land Buildings and Improvements Capitalization Subsequent to Acquisition Land Building & Improvements Total Accumulated Depreciation Date of Construction Date Acquired SEC Schedule III, Real Estate and Accumulated Depreciation Disclosure [Abstract] Balance-Beginning of Year Acquisitions Improvements Total Additions Sales Total Deletions Balance-End of Year Balance-Beginning of Year Depreciation Sales Balance-End of Year Total Additions Total Disposals Agreement [Member] Agreement Two [Member] Altoona [Member] Altoona, PA [Member] Augusta (FDX Ground) [Member] Augusta (FDX) [Member] Augusta FDX Gr. Augusta, GA (FDX Ground) [Member] Augusta, GA (FDX) [Member] Available-for-sale securities, cost. Available-for-sale securities, debt securities, cost. Available-for-sale Securities, debt securities, number of shares. Available-for-sale securities, equity securities, cost. BMO Capital Market [Member] BMO Capital Markets [Member] Bedford Heights (Cleveland) [Member] Bedford Heights (Cleveland), OH [Member] Bedford Heights. Bedford Heights, OH (Cleveland) [Member] Beltsville, MD (Washington, DC) [Member] Beltsville, MD (Washington, DC) [Member] Beltsville. Beltsville (Washington, DC), MD [Member] Beltsville (Washington, DC) [Member] Board of Directors [Member] Book tax difference on gains losses from capital transactions. Buckner, KY (Louisville) [Member] Buckner (Louisville), KY [Member] Buckner (Louisville) [Member] Buckner Buffalo MSA [Member] Building Expansion [Member] Burlington (Seattle/Everett) [Member] Burlington (Seattle/Everett), WA [Member] Burlington, WA [Member] Burlington, WA (Seattle/Everett) [Member] Burr Ridge (Chicago), IL [Member] Burr Ridge (Chicago) [Member] Burr Ridge. The amount of acquisition cost of a business combination allocated to property, plant and equipment to be used in ongoing operations. CBL &amp; Associates Properties, Inc [Member] Campus Crest Communities, Inc [Member] Capitalized Lease Costs And Financing Costs [Member] Carlstadt. Carlstadt, NJ (New York, NY) [Member] Carlstadt (New York, NY) [Member] Carrollton (Dallas) [Member] Carrollton (Dallas), TX [Member] Carrollton, TX (Dallas) [Member] Cedar Realty Trust, Inc [Member] Charlotte Metropolitan Statistical Area [Member] Charlottesville [Member] Charlottesville, VA [Member] Chattanooga [Member] Chattanooga, TN [Member] Cheektowaga (Buffalo) [Member] Cheektowaga (Buffalo), NY [Member] Cheektowaga. Cheektowaga, NY (Buffalo) [Member] Chesapeake Lodging Trust [Member] Cincinnati MSA [Member] Cincinnati [Member] Cincinnati, OH [Member] Cocoa, FL [Member] Cocoa, FL [Member] Colorado Springs, CO [Member] Colorado Springs, CO [Member] Colorado Springs, CO [Member] Colorado Springs [Member] Concord (Charlotte) [Member] Concord (Charlotte), NC [Member] Concord, NC (Charlotte) [Member] Concord, NC [Member] Condor Hospitality [Member] Corporate Office Properties Trust [Member] Corporate office rent expense. Corporate office rent per square foot. Corpus Christi [Member] Corpus Christi, TX [Member] Covington, LA [Member] Covington, LA (New Orleans) [Member] Covington (New Orleans), LA [Member] Covington (New Orleans) [Member] Cudahy. Cudahy (Milwaukee) [Member] Cudahy (Milwaukee), WI [Member] Dallas MSA [Member] Davenport, FL [Member] Davenport, FL (Orlando) [Member] Davenport (Orlando), FL [Member] Davenport (Orlando) [Member] Represents interest rate basis for effective rate on current leverage Ratio. December 31 [Member] Denver, CO [Member] Denver [Member] Description Of Business [Policy Text Block] Dividend Distribution Four [Member] Dividend Distribution One [Member] Dividend Distribution Three [Member] Dividend Distribution Two [Member] Dividend income on securities availabe for sale. Dividend rate in percentage of preferred stock. Dividend reinvested shares weighted average grant date fair value. Dividend Reinvestment and Stock Purchase Plan [Member] Perecnt dividend requirement for estimated taxable income. Dividend Three [Member] Dividend Two [Member] Dynex Capital, Inc [Member] EPR Properties [Member] Edinburg [Member] Edinburg, TX [Member] Edwardsville, KS (Kansas City)(Carlisle Tire) [Member] Edwardsville, KS (Kansas City) (International Paper) [Member] Edwardsville (Kansas City)(Carlisle Tire) [Member] Edwardsville (Kansas City)(International Paper) [Member] Edwardsville (Kansas City), KS (Carlisle) [Member] Edwardsville (Kansas City), KS (International Paper) [Member] Edwardsville. El Paso [Member] El Paso, TX [Member] El Paso, Texas. Elgin (Chicago), IL [Member] Elgin (Chicago) [Member] Elgin, IL (Chicago) [Member] Elgin. Equity security available for sale, number of shares. Estimated dividends paid deduction. Face amount or stated value of Excess Stock per share; generally not indicative of the fair market value per share. Aggregate par or stated value of issued nonredeemable Excess Stock (or Excess Stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity. FDX And Subsidiaries And Milwaukee Electric Tool Corporation [Member] Estimated forfeitures of stock options. Fayetteville [Member] Fayetteville, NC [Member] FDX and Subsidiaries. FDX. Fedex And Fedex Subsidiaries [Member] Fedex Corporation [Member] Fedex Corporation Subsidiaries Member [Member] Fedex Ground Package System Inc. [Member] Fedex Ground Package System Inc [Member] Fort Worth (Dallas) [Member] Fort Worth, TX (Dallas) [Member] Fort Worth, TX [Member] Represents Frankfort, KY (Jim Beam). Frankfort, KY (Lexington) [Member] Frankfort, KY [Member] Frankfort (Lexington), KY [Member] Frankfort (Lexington) [Member] Ft. Mill (Charlotte, NC) [Member] Ft. Mill (Charlotte, NC), SC [Member] Ft. Mill. Ft. Mill, SC (Charlotte, NC) [Member] Ft. Myers, FL [Member] Ft. Myers, FL [Member] Ft. Worth (Dallas), TX [Member] Represents Ft. Worth, TX. General Electric Company [Member] General Growth Properties, Inc [Member] Getty Realty Corporation [Member] Gladstone Commercial Corporation [Member] Government National Mortgage Association [Member] Government Properties Income Trust [Member] Grace Acquisitions I [Member] Granite City, IL (St. Louis, MO) [Member] Granite City. Granite City (St. Louis, MO), IL [Member] Granite City (St. Louis, MO) [Member] Green Bay [Member] Green Bay, WI [Member] Greenwood, IN [Member] Greenwood (Indianapolis), IN [Member] Greenwood (Indianapolis) [Member] Griffin (Atlanta), GA [Member] Griffin (Atlanta) [Member] Griffin, GA (Atlanta) [Member] Griffin, GA (Atlanta) Halfmoon (Albany) [Member] Halfmoon (Albany), NY [Member] Halfmoon. Halfmoon, NY (Albany) [Member] Hamburg, NY [Member] Hanahan (Charleston) (FDX Ground) [Member] Hanahan (Charleston) (SAIC) [Member] Hanahan (Charleston), SC (FDX Ground) [Member] Hanahan (Charleston), SC (SAIC) [Member] Hanahan (FDX). Hanahan Norton. Hanahan, SC (Charleston) (FDX Ground) [Member] Hanahan, SC (Charleston) (SAIC) [Member] Houston [Member] Houston, TX [Member] Huntsville, AL [Member]. Huntsville, AL [Member] iStar Financial, Inc [Member] Imperial, PA [Member] Imperial, PA (Pittsburgh) [Member] Imperial (Pittsburgh) [Member] Imperial (Pittsburgh), PA [Member] Increase (Decrease) other assets and capitalized lease costs. Indianapolis, IN (FDX Ground) [Member] Indianapolis, IN [Member] Indianapolis, IN (Ulta) [Member] Indianapolis MSA [Member] Indianapolis, IN (FDX Ground) [Member] Industrial Building [Member] Intangible Assets, Lease Costs and Financing Costs. Interest income on securities availabe for sale. Interest rate on debt securities available for sale. Investors Real Estate Trust [Member] Jacksonville (FDX Ground) [Member] Jacksonville (FDX) [Member] Jacksonville, FL (FDX Ground) [Member] Jacksonville, FL (FDX) [Member] Jacksonville, FL (FDX) [Member] Jacksonville, FL [Member] Represents Jacksonville, FL (FDX Gr). Jacksonville. January 1, 2020 [Member] June 30 [Member] Kansas City, MO (Bunzl) [Member] Kansas City, KS (Bunzl) [Member] Kansas City (Kellogg) [Member] Kansas City, MO (Bunzl) [Member] Kansas City, MO (Kellogg) [Member] Kansas City, MO [Member] Kansas City MSA [Member] Kansas City. Kilroy Realty Corporation [Member] Lakeland, FL [Member] Lakeland, FL [Member] Lease Agreement [Member] Lease Concentration Risk [Member] Lease Expiration Date Description. Lease term. Represents a settlement with former tenants for the early termination of a lease. Leases percentage of total Property. Lebanon (Cincinnati) [Member] Lebanon (Cincinnati), OH [Member] Lebanon, Ohio. Lebanon (Nashville) [Member] Lebanon (Nashville), TN [Member] Lebanon, OH (Cincinnati) [Member] Lebanon, TN (Nashville) [Member] Lessee concentration risk. Lexington MSA [Member] Liberty (Kansas City), MO [Member] Liberty (Kansas City) [Member] Liberty. Lindale, TX [Member] Lindale, TX (Tyler) [Member] Lindale (Tyler) [Member] Lindale (Tyler), TX [Member] Livonia Detroit MI. Livonia (Detroit) [Member] Livonia, MI (Detroit) [Member] Loan Payable Fair Value [Member] Loan Payable [Member] Loan secured with common stock. Loan secured with preferred stock. Louisville, KY [Member] Louisville [Member] Mack-Cali Realty Corporation [Member] March 31 [Member] Margin Loans [Member] Mechanicsville (Richmond) (FDX) [Member] Memphis [Member] Memphis, TN [Member] Milwaukee Electric Tool Corporation [Member] Monaca. Monaca (Pittsburgh) [Member] Monaca (Pittsburgh), PA [Member] Monroe (Cincinnati) [Member] Monroe (Cincinnati), OH [Member] Monroe (Cincinnati), OH [Member] Monroe, NC [Member] Monroe, OH (Cincinnati) [Member] Monroe. Montgomery (Chicago), IL [Member] Montgomery (Chicago) [Member] Montgomery (Chicago), IL [Member] Mortgage Loan Subsequently Fiscal Yearend [Member] Mortgage loans on commitment, interest rate. Mortgage loans on real estate, weighted average interest rate. Mortgage loans on real estate, new acquisitions. Mortgage Notes and Loans Payable [Text Block] Mortgage Notes Payable Fair Value [Member] Mortgage Notes Payable [Member] Mortgage Notes Payable. Mortgage Notes Payable Under Commitment [Member] New Orleans MSA [Member] Newington (Hartford), CT [Member] Newington (Hartford) [Member] Newington. Number of full-time employees. Number of part-time employee. Number of shares purchased through UMH's dividend reinvestment. Number of Stock Options Grants. O'Fallon member. O&#8217;Fallon (St. Louis), MO [Member] O'Fallon (St. Louis) [Member] October 14, 2016 [Member] October 28, 2016 [Member] October 27, 2016 [Member] Oklahoma City [Member] Oklahoma City, OK [Member] Olathe, KS (Kansas City) [Member] Olathe, KS [Member] Olathe (Kansas City), KS [Member] Olathe (Kansas City) [Member] Olive Branch, MS [Member] Olive Branch, MS (Memphis, TN) (Anda Distribution) [Member] Olive Branch, MS (Memphis, TN) (Anda) [Member] Olive Branch, MS (Memphis, TN) (Milwaukee Tool) [Member] Olive Branch, MS [Member] Olive branch. Olive Branch (Memphis, TN)(Anda Distribution) [Member] Olive Branch (Memphis, TN)(Milwaukee Tool) [Member] Olive Branch Milwaukee Tool. Omaha [Member] Omaha, NE [Member] One Property [Member] Orangeburg. Orangeburg (New York) [Member] Orangeburg (New York), NY [Member] Orion, MI [Member] Orion, MI [Member] Orlando, FL [Member] Orlando MSA [Member] Orlando, FL [Member] Other book tax differences net. PalmerTerraceRealtyAssociatesLLC [Member] Pennsylvania Real Estate Investment Trust [Member] Percentage of amount available to borrow on margin. Percentage of amount available to borrow on margin, interest rate. Represent the Percentage Of capitalization rate to net operating income. Percentage of marketable securities to undepreciated assets. Percentage of real estate property leased. Represents Percentage of salary allocate to affiliate. Represents Percentage of salary allocate to company. Pittsburgh MSA [Member] Portion designated capital losses gains distribution. Aggregate dividends paid during the period for each share of preferred stock diluted outstanding. Property Purchase Agreement [Member] Punta Gorda, FL [Member] Punta Gorda, FL [Member] Purchase Amount For Commitments [Member] Expansion square feet. Ralcorp Holdings Inc. Period the property was acquired. Date the property was constructed. Real Estate Gross Value. Rreconciles cash dividends paid Return of capital. Reconciles net income attributable to common shares to Estimated taxable income subject to dividend requirement. Reconciles net income attributable to common shares to taxable income add (less) capital gains (losses). Reconciles net income attributable to common shares to taxable income deferred compensation. Taxable income before adjustments. Reconciliation of carrying amount of real estate investments additions, net. Reconciliation of carrying amount of real estate investments deletion, net Renatable space. Rent increased to after expansion. Rental and reimbursement revenue. Rental And Reimbursement Revenue [Member] Rental and reimbursement revenue percentage. Richfield (Cleveland) [Member] Richfield (Cleveland), OH [Member] Richfield. Richfield, OH (Cleveland) [Member] Richfield, OH (Cleveland) [Member] Richland (Jackson), MS [Member] Richland (Jackson) [Member] Richland. Richmond (Carrier). Richmond (FDX). Richmond (United Technologies) [Member] Represents Richmond, VA (Carrier). Represents Richmond, VA (FDX). Ridgeland (Jackson), MS [Member] Ridgeland (Jackson) [Member] Ridgeland [Member] Roanoke (CHEP) [Member] Roanoke (FDX Ground) [Member] Roanoke [Member] Roanoke, VA (CHEP) [Member] Roanoke, VA (DHL) [Member] Roanoke, VA (FDX Ground) [Member] Roanoke, VA [Member] Rockford (B/E Aerospace) [Member] Rockford, IL (B/E Aerospace) [Member] Rockford, IL [Member] Rockford, IL (Sherwin-Williams) [Member] Represents Rockford, IL (B/E Aerospace. Rockford. Rockford (Sherwin-Williams) [Member] Romulus (Detroit), MI [Member] Romulus (Detroit) [Member] Romulus. Sauget, IL [Member] Sauget, IL (St. Louis, MO) [Member] Sauget (St. Louis, MO), IL [Member] Sauget (St. Louis, MO) [Member] Schaumburg (Chicago), IL [Member] Schaumburg (Chicago) [Member] Schaumburg. Schedule of Cash Dividends Paid and Dividends Paid Deduction [Table Text Block] Schedule of Net Income and Taxable Income [Table Text Block] Schedule of shares issued in connection with dividend reinvestment and stock purchase plan. Seattle/Everett MSA [Member] Security availabe for sale, maximum percentage of ownership. Security two. Select Income REIT [Member] Senior Housing Property Trust [Member] September 30 [Member] Series A Cumulative Redeemable Preferred Stock [Member] Series B Cumulative Redeemable Preferred Stock [Member] Series I Preferred Stock [Member] Series L Preferred Stock [Member] Date the equity-based award grant, in CCYY-MM-DD format. Share based compensation arrangement by share based payment award option price. Shares for secure loan. Shelby County [Member] Shopping Center [Member] Somerset [Member] Somerset, NJ [Member] Spring (Houston) [Member] Spring (Houston), TX [Member] Spring, TX (Houston) [Member] St. Joseph, MO [Member] St. Joseph [Member] St. Louis, MO MSA [Member] Stewartville, MN (Rochester) [Member] Stewartville (Rochester), MN [Member] Stewartville (Rochester) [Member] Non-vested, Shares, Dividend reinvested shares. Stock Option [Member] Stock Option [Member] Stock Option [Member] Stock Option [Member] Stock Option [Member] Stock Option [Member] Stock Option [Member] Streetsboro (Cleveland) [Member] Streetsboro (Cleveland), OH [Member] Streetsboro, Ohio. Streetsboro, OH (Cleveland) [Member] Disclosure of cash distributions to common shareholders. Summit Hotel Properties, Inc [Member] Sun Communities, Inc [Member] Tampa (FDX Ground) [Member] Tampa (FDX) [Member] Tampa, FL (FDX Ground) [Member] Tampa, FL (FDX) [Member] Tampa, FL [Member]. Tampa, FL (TB Grand Prix) [Member] Tampa, FL (Tampa Bay Grand Prix) [Member] Tampa FDX Gr. Tampa (Tampa Bay Grand Prix) [Member] Tenant security deposits. Three Properties [Member] Tolleson, AZ (Phoenix) [Member] Tolleson. Tolleson (Phoenix), AZ [Member] Tolleson (Phoenix) [Member] Topeka, KS [Member] Topeka, KS [Member] TreeHouse Private Brands, Inc [Member] Tulsa [Member] Tulsa, OK [Member] Two River Community Bank [Member] Two thousand seven stock option plan. Tyler MSA [Member] UMH Properties Inc [Member] ULTA, Inc. UMH common stock shares purchased during the period. UMH common stock value purchased during the period. UMH purchase of the company's common stock shares purchased during the period. UMH purchase of the company's common stock value purchased during the period. Unearned reimbursement revenue. Urbandale (Des Moines), IA [Member] Urbandale (Des Moines) [Member] Urbandale. Vacant Building [Member] Vacant Land [Member] Vice President of Investor Relations [Member] Waco [Member] Waco, TX [Member] Weighted average lease maturity term. Represents period of weighted average loan maturity of the mortgage notes payable. West Chester Twp. (Cincinnati) [Member] West Chester Twp (Cincinnati), OH [Member] West Chester Twp. West Chester Twp., OH (Cincinnati) [Member] Wheeling (Chicago), IL [Member] Wheeling (Chicago) [Member] Wheeling, IL (Chicago) [Member] Wheeling. White Bear Lake MN [Member] White Bear Lake. White Bear Lake (Minneapolis/St. Paul), MN [Member] White Bear Lake (Minneapolis/St. Paul) [Member] White Beat Lake, MN [Member] Winston-Salem [Member] Represents Winston-Salem, NC. Securities available for sale at fair value. Dividend percentage on equity security available for sale. Redemption of series A preferred stock. Redemption of series B preferred stock. Proceeds from market preferred equity program. Summary of Operations Results for Properties Acquisition [Table Text Block] Summary of Range of Losses [Table Text Block] Number of individual securities. Security One [Member] Security Three [Member] Franklin Street Properties [Member] VEREIT, Inc. [Member] Washington Prime Group, Inc [Member] Over 18 Years [Member] Mortgage One [Member] Mortgage Two [Member] Oklahoma City, OK (Bunzl) [Member] Greenwood, IN (Indianapolis) [Member] Walker, MI (Grand Rapids) [Member] Hamburg, NY (Buffalo) [Member] Mesquite, TX (Dallas) [Member] Aiken, SC (Augusta, GA) [Member] Homestead, FL (Miami) [Member] Concord, NC (Charlotte) One [Member] Kenton, OH [Member] Stow, OH [Member] Ft. Myers, FL (FDX Ground) [Member] Walker, MI (Grand Rapids) [Member] Rockford, IL (Sherwin-Williams Co.) [Member] Amended and Restated 2007 Incentive Award Plan [Member] Olive Branch, MS (Memphis, TN)(Anda Pharmaceuticals, Inc.) [Member] Rockford, IL (Collins Aerospace Systems-United Technologies) [Member] Oklahoma City, OK (Bunzl Distribution Oklahoma, Inc.) [Member] Imperial, PA (Pittsburgh) [Member] Stock Option Eight [Member] Fair value of security cost percentage. Amortization expense related to deferred leasing and financing costs. Lease termination income description. Portion of income which is not taxable, Description. Percentage of taxable income. Percentage of assets in real estate investments. Ft. Myers (Vacant) [Member] Ft. Myers (FDX Ground) [Member] Homestead (Miami) [Member] Rockford (Collins Aerospace Systems-United Technologies) [Member] Rockford (Sherwin-Williams Co.) [Member] Urbandale (Des Moines) (Vacant) [Member] Olive Branch (Memphis, TN) (Anda Pharmaceuticals, Inc.) [Member] Hamburg (Buffalo) [Member] Concord (Charlotte) 1 [Member] Kenton [Member] Stow [Member] Oklahoma City (FDX Ground)[Member] Oklahoma City (Bunzl) [Member] Aiken (Augusta, GA) [Member] Ft. Worth (Dallas) [Member] Mesquite (Dallas) [Member] Mechanicsville (Richmond) [Member] Richmond [Member] Roanoke (CHEP USA) [Member] Rockford (Collins Aerospace Systems) [Member] Walker (Grand Rapids) [Member] Property type of real estate investment. Orangeburg NY [Member] Purchase price of industrial building. Mortgage loan on real estate expiration period. Expansion square feet. Cost of building expansion. Lease period. This element represents the cost of parking expansion whether long-term or daily, charged for parking facilities. Increase in annual rent. Rent prior to expansion. Rent prior to expansion, per square foot. Rent increased to after expansion, per square foot. Annualized rent after expansion. Square feet before expansion Lease on real estate terms. Percentage of annual rent increase. Annualized rent after expansion, per square foot. In-Place Leases [Member] Business Acquisitions Purchase Price Allocation Of Properties Acquired. Rental Revenue. The pro forma real estate taxes for a period as if the business combination or combinations had been completed at the beginning of the period. The pro forma operating expenses for a period as if the business combination or combinations had been completed at the begining of the period. The pro formo depreciation and amortization for a period as if the business combination or combinations had been completed at the begining of the period. The pro forma interest expense for a period as if the business combination or combinations had been completed at the begining of the period. The pro forma income loss from operations for a period as if the business combinations had been completed at the begining of the period. The pro forma gain on sale of real estate investment for a period as if the business combination or combinations had been completed at the begining of the period. Fiscal Year 2018 [Member] Fiscal Year 2019 [Member] Fiscal Year 2020 [Member] Fiscal Year 2021 [Member] Fiscal Year 2022 [Member] Tenant Improvements [Member] Richmond, VA [Member] Hamburg (Buffalo), NY [Member] Walker (Grand Rapids), MI [Member] Mesquite (Dallas), TX [Member] Aiken (Augusta, GA), SC [Member] Homestead (Miami), FL [Member] Concord (Charlotte), NC One [Member] Real Estate Held for Sale [Member] Ft. Myers, FL (Vacant) [Member] Industrial Buildings ,Shopping Center and Vacant Land [Member] Mechanicsville (Richmond), VA (FDX) [Member] Roanoke, VA (CHEP USA) [Member] Oklahoma City, OK (FDX Ground) [Member] Hamburg (Buffalo), NY [Member] Amended and Restated 2007 Incentive Award Plan [Member] Non-Employee Directors [Member] Extend the term of plan for an additional ten years. Exercise price per common share percentage under plan. Fair value of option granted shares. Remaining unamortized stock option expenses. Number of participants. Grant date fair value of option granted. October 2, 2017 [Member] Series C Cumulative Redeemable Preferred Stock [Member] Preferred Stock ATM Program [Member] Represent the percentage of increase in common stock dividend per share. Represent the Annual common stock dividend rate per share. Represent the period of cash dividend maintained. Preferred stock accrued dividend per share. Dividend rate on Series A Preferred Stock. Net Accrued Dividend Paid at Redemption. Proceeds from offering used to pay down line of credit. Net proceeds from public offering used to Redeem Series A Preferred Stock. Gross proceeds. Net proceeds from offering. Description of redemption of preferred stock outstanding. Description of redemption of preferred stock outstanding upon the occurrence of Change of Control. Gross amount of cash inflow from capital contributions to an entity associated with a dividend reinvestment plan. Amount of dividend reinvested. Contingencies and Commitments. Contingencies and Commitments. Business acquisition, purchase price allocation, property, plant and equipments. Percentage of building area leased. Number of real estate properties committed to mortgage. Mortgages Minimum Interest Rate. Mortgages Maximum Interest Rate. Mortgage loans on real estate weighted average interest rate. Mortgage loan amortization period. Charleston, SC [Member] Amount of acquisition cost of a business combination allocated to buildings included in real estate. Mortgage loans on real estate, term of loan. Face amount of mortgages. Mortgage loans on real estate, interest rate. Annual rental income. Cost of expansion. Rent increased to expansion per squre foot. The total amount of revenue recognized for the period from operating leases, including minimum lease revenue, contingent revenue, percentage revenue, sublease revenue and tenant reimbursements. Underwritten Public Offering [Member] At-The-Market Offerings [Member] Five Lease [Member] Reduction in fixed rate mortgage note payable liability. Reclassification of amortization of financing costs. Kansas City, MO (Kellogg) [Member] Orangeburg NY [Member] Monroe, NC [Member] White Bear Lake (Minneapolis/St. Paul), MN [Member] Net Rental Income. Acquired in-pace Leases [Member] New Buildings [Member] Available for sale securities range of loss in percentage. Unsecured revolving line of credit, BMO interest rate description. Edwardsville (Kansas City), KS (Carlisle Tire) [Member] Marcus Assosiates [Member] Schedule of Disposition and Real Estate Classified as Held for Sale [Table Text Block] The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. The net gain (loss) resulting from sales and other disposals of real estate owned for investment purposes. Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders. Net lease maturity term. Lease Agreement Year 1 [Member] Lease Agreement Year 2 [Member] Lease Agreement Year 3 [Member] Lease Agreement Year 4 [Member] Lease Agreement Year 5 [Member] Lease Agreement Year 6 [Member] Lease Agreement Year 7 [Member] Increase in rent from expansion. Interest rate. Percentage of common shares available under plan without minimum vesting period. Total loans payable. Amortization expense for existing assets in year 2018. Amortization expense for existing assets in year 2019. Amortization expense for existing assets in year 2020. Amortization expense for existing assets in year 2021. Amortization expense for existing assets in year 2022. Tampa (FDX) [Member] Sale of industrial building. Annual rental income over the remaining term of lease. Lease expiration date. Expansion of industrial building. Lease expiration date change. Contracted price to sell. Size of industrial building. Lease termination fees percentage. Change in face amount of mortgages. Mesquite, TX [Member] Aiken, SC [Member] Homestead, FL [Member] Orangeburg NY Kellogg [Member]. Another Ft. Myers, FL [Member] Contracted price. Gain on sale of real estate. Covington, LA [Member] Lease expiration date after expansion. Lease expiration prior to expansion. Face amount of mortgage prior to expansion. Size of building after expansion. Ft. Myers, FL [Member] ColoradoSpringsMember ColoradoSpringsCoMember JacksonvilleFLFDXOneMember RichfieldOHClevelandMember RoanokeVAFDXGroundMember Jacksonville [Member] TampaFDXMember Augusta Fdx Gr [Member] Tampa Fdx Gr [Member] Richmond Carrier [Member] El Paso Texas [Member] Rockford [Member] Olive Branch (Milwaukee Tool), MS [member] EdwardsvilleThreeMember Jacksonville Fl Fdx Gr [Member] RidgelandJacksonMSMember RichlandJacksonMSMember Interest Income On Securities Availabe For Sale WheelingChicagoILMember MontgomeryChicagoILMember Ridgeland [Member] FtMillCharlotteNCSCMember LebanonNashvilleTNMember StreetsboroClevelandOHMember HalfmoonAlbanyNYMember Mortgage Notes Payable [Table Text Block] SaugetStLouisMOILMember FrankfortLexingtonKYMember MonroeCincinnatiOHMemberMember Mortgage Loans On Real Estate, Term Of Loan RockfordILBEAerospaceMember MonacaPittsburghPAMember SchaumburgChicagoILMember BurrRidgeChicagoILMember Reconciliation Of Carrying Amount Of Real Estate Investments Deletion Net LibertyKansasCityMOMember NewingtonHartfordCTMember CudahyMilwaukeeWIMember GraniteCityStLouisMOILMember ElginChicagoILMember TollesonPhoenixAZMember HanahanCharlestonSCSAICMember HanahanCharlestonSCFDXGroundMember RichfieldClevelandOHMember GriffinAtlantaGAMember RoanokeVACHEPUSAMember TampaFLTampaBayGrandPrixMember RockfordILSherwinWilliamsCoMember OklahomaCityOKFDXGroundMember ConcordCharlotteOneMember KansasCityMOMember FtMyersFLTenMember HamburgBuffaloNYMember Board of Directors Chairman [Member] KansaCityMOMember OrangeburgNYOneMember MonroeNcOneMember WhiteBearLake1Member CovingtonLaMember Real Estate Investment Property, at Cost Assets Liabilities Stockholders' Equity Attributable to Parent Liabilities and Equity Real Estate Revenue, Net Interest Expense, Other Long-term Debt Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Net Income (Loss) Attributable to Parent Net Income (Loss) Available to Common Stockholders, Basic Income (Loss) from Extraordinary Items, Net of Tax, Per Basic Share Income (Loss) from Operations before Extraordinary Items, Per Diluted Share Granite City [Member] Income (Loss) from Extraordinary Items, Net of Tax, Per Diluted Share Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Comprehensive Income (Loss), Net of Tax, Attributable to Parent Stock Redeemed or Called During Period, Value Straight Line Rent Gain (Loss) on Sale of Securities, Net Increase (Decrease) in Receivables Increase (Decrease) in Prepaid Expense and Other Assets Net Cash Provided by (Used in) Operating Activities</