Measurement Frequency [Axis] Fair Value Measurements [Member] Major Types of Debt and Equity Securities [Axis] Preferred Stock [Member] Fair Value, Hierarchy [Axis] Level 3 [Member] Mortgage Backed Securities [Member] Common Stock [Member] Level 2 [Member] Level 1 [Member] Class Of Stock [Axis] Series C Preferred Stock [Member] Plan Name [Axis] Preferred Stock ATM Program [Member] Property, Plant and Equipment, Type [Axis] Buildings [Member] Real Estate Property Ownership [Axis] Kansas City, MO (Kellogg) [Member] Report Date [Axis] July 31, 2018 [Member] Orangeburg NY [Member] Ridgeland (Jackson), MS [Member] Urbandale (Des Moines), IA [Member] Rockford, IL (Sherwin-Williams Co.) [Member] Roanoke, VA (FDX Ground) [Member] Equity Components [Axis] Stock Options [Member] Real Estate, Type of Property [Axis] Industrial Buildings [Member] FedEx Corporation [Member] Amazon.com Services, Inc [Member] Fedex Ground Package System Inc. [Member] Ft. Myers [Member] Colorado Springs, CO [Member] Series C Cumulative Redeemable Preferred Stock [Member] Series A Cumulative Redeemable Preferred Stock [Member] Series B Cumulative Redeemable Preferred Stock [Member] Fedex And Fedex Subsidiaries [Member] Fedex Corporation Subsidiaries Member [Member] Concentration Risk Type [Axis] Rental And Reimbursement Revenue [Member] Scenario [Axis] Fiscal Year 2018 [Member] Fiscal Year 2017 [Member] Land [Member] Buildings [Member] In-Place Leases [Member] Business Acquisition [Axis] UMH Properties, Inc [Member] Common and Preferred Stock [Member] Debt Security Category [Axis] Securities One [Member] Securities Two [Member] Securities Three [Member] Range [Axis] Minimum [Member] Maximum [Member] One Mortgages Loans [Member] Mortgages Loans [Member] Three Mortgages Loans [Member] Short-term Debt, Type [Axis] Line of Credit [Member] Dividend Reinvestment and Stock Purchase Plan [Member] Debt Instrument [Axis] Mortgage Notes Payable Fair Value [Member] Financial Instrument [Axis] Property Purchase Agreement [Member] Industrial Building [Member] Properties One [Member] Properties Two [Member] Series A Preferred Stock [Member] Kansas City, MO and Orangeburg, NY [Member] Real Estate Held for Sale [Member] Securities Four [Member] Four Properties [Member] Lease Arrangement, Type [Axis] Four Lease [Member] Stock Options One [Member] Stock Options Two [Member] Shaw Industries, Inc [Member] B. Braun Medical Inc. [Member] White Bear Lake, MN [Member] Two Mortgages Loans [Member] Title of Individual [Axis] Board of Directors [Member] April 2, 2018 [Member] Legal Entity [Axis] FedEx Ground Package System, Inc [Member] Subsequent Event Type [Axis] Subsequent Event [Member] Related Party [Axis] Common Shareholders [Member ] Series C Preferred Shareholders [Member] Kansas City, MO (Kellogg) and Orangeburg [Member] Amazon Fulfillment Services, Inc [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 Filer Category 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 $13,267,014 and $13,404,318, respectively Capitalized Lease Costs, net of Accumulated Amortization of $3,331,272 and $3,393,187, respectively Financing Costs, net of Accumulated Amortization of $807,345 and $619,555, 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 Total Liabilities COMMITMENTS AND CONTINGENCIES Shareholders’ Equity: 6.125% Series C Cumulative Redeemable Preferred Stock, $0.01 Par Value Per Share: 12,400,000 Shares Authorized as of March 31, 2018 and September 30, 2017; 11,095,376 and 9,839,445 Shares Issued and Outstanding as of March 31, 2018 and September 30, 2017, respectively Common Stock, $0.01 Par Value Per Share: 192,039,750 Shares Authorized as of March 31, 2018 and September 30, 2017; 78,846,177 and 75,630,521 Shares Issued and Outstanding as  of March 31, 2018 and September 30, 2017, respectively Excess Stock, $0.01 Par Value Per Share: 200,000,000 Shares Authorized as of March 31, 2018 and September 30, 2017; No Shares Issued or Outstanding as of March 31, 2018 and  September 30, 2017 Additional Paid-In Capital Accumulated Other Comprehensive Income (Loss) 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 & 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 Interest Expense, including Amortization of Financing Costs TOTAL OTHER INCOME (EXPENSE) INCOME FROM CONTINUING OPERATIONS, BEFORE GAIN ON SALE OF REAL ESTATE INVESTMENTS Gain on Sale of Real Estate Investments NET INCOME Less: Preferred Dividends NET INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS BASIC INCOME – PER SHARE Net Income Less: Preferred Dividends Net Income Attributable to Common Shareholders - Basic DILUTED INCOME – PER SHARE Net Income Less: Preferred Dividends 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 Realized in Income TOTAL COMPREHENSIVE INCOME (LOSS) COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO COMMON SHAREHOLDERS Statement of Cash Flows [Abstract] CASH FLOWS FROM OPERATING ACTIVITIES Noncash Items Included in Net Income: Depreciation & Amortization Deferred Straight Line Rent Stock Compensation Expense Gain on Sale of Securities Transactions (Gain) / Loss 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 from Sale of Real Estate Investments 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 Net Draws (Repayments) on Loans Payable Proceeds from Fixed Rate Mortgage Notes Payable Principal Payments on Fixed Rate Mortgage Notes Payable Financing Costs Paid on Debt Proceeds from the Exercise of Stock Options Redemption of 7.625% Series A Preferred Stock Proceeds from Underwritten Public Offering of 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 Preferred Dividends Paid Common Dividends Paid, net of Reinvestments NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS CASH AND CASH EQUIVALENTS - BEGINNING OF PERIOD CASH AND CASH EQUIVALENTS - END OF PERIOD Preferred stock dividend rate Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization and Accounting Policies Earnings Per Share [Abstract] Net Income Per Share Real Estate [Abstract] Real Estate Investments Investments, Debt and Equity Securities [Abstract] Securities Available for Sale at Fair Value Debt Disclosure [Abstract] Debt Equity [Abstract] Shareholders' Equity Fair Value Disclosures [Abstract] Fair Value Measurements Supplemental Cash Flow Elements [Abstract] Supplemental Cash Flow Information Commitments and Contingencies Disclosure [Abstract] Contingencies and Commitments Subsequent Events [Abstract] Subsequent Events Use of Estimates Reclassification Lease Termination Income Stock Compensation Plan Recent Accounting Pronouncements Segment Reporting & Financial Information Summary of Stock Options Outstanding Schedule of Stock Options, Valuation Assumptions Schedule of Properties Acquired During Period Accounted for Asset Acquisitions Summary of Consolidated Statements of Income for Properties Acquired Summary of Income or Operation Statements Schedule of Pro Forma Information Schedule of Temporary Impaired Securities Summary of Range of Losses Summary of Fixed Rate Mortgage Notes Payable Summary of Fair Value of Financial Assets Number of real estate properties owned Total square foot of property Percentage of properties occupied Weighted average building age Annualized average base rent per square foot REIT investment securities, description Total gross real estate investments Marketable REIT securities investments Percentage of undepreciated assets Value of property sold Proceeds from sale of property Gain on real estate properties Percentage of gain on properties Net gain on historic cost Percentage of net gain over the historic cost basis Potential lease termination income Percentage of weighted average lease termination income Stock based compensation expense Weighted average fair value of stock option Number Restricted stock shares granted Weighted average exercise price per share Total proceeds Number of stock option exercised Stock option shares available for grant Option to purchase shares outstanding Aggregate intrinsic value of options Date of Grant Number of Employees Number of Shares Option Price Expiration Date Dividend yield Expected volatility Risk-free interest rate Expected lives (years) Estimated forfeitures Common stock equivalents included in the diluted weighted average shares outstanding Antidilutive securities Purchase of industrial building Area of property Percentage of building area leased Lease term Lease term expiration period Purchase price of industrial building Mortgage loan amortization period Face amount of mortgages Mortgage loans on real estate, interest rate Annual rental income over the remaining term of lease Mortgage loan period Transaction costs Cost of building expansion Lease expiration date description Increase in 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 Lease termination income Sale of industrial building Square feet of real estate property leased Weighted average lease maturity Percentage of real estate property leased Percentage of rental space and tenant account, description Percentage of aggregate rental and reimbursement revenue Held marketable securities Percentage of un depreciated assets Purchase price allocation of properties acquired Rental Revenue Net Income Attributable to Common Shareholders Rental and Reimbursement Revenue Real Estate Taxes Operating Expenses Depreciation & Amortization Interest Expense, including Amortization of Financing Costs Income from Operations Gain (Loss) on Sale of Real Estate Investment Net Income Rental Revenues Net Income Attributable to Common Shareholders Basic and Diluted Net Income per Share Attributable to Common Shareholders Schedule of Available-for-sale Securities [Table] Schedule of Available-for-sale Securities [Line Items] Securities available for sale at fair value Security available for sale, maximum percentage of investment on un depreciated assets Proceeds from sales or redemptions of securities available for sale Gain on sale of securities available for sale Dividend income on investment in securities Purchase of securities available for sale UMH common shares purchased during the quarter Cost of securities purchased Dividend reinvestment and stock purchase plan cost, per share Shares owned by company Shares owned, cost Available for sale securities, shares Dividend rate of preferred stock held as security for loan Net unrealized gains on securities portfolio 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 Amortization of financing costs Annual interest rate Weighted average interest rate percentage Notes payable maturity period Mortgage loan amortizing over period Proceeds from fixed rate mortgage notes payable Repayment of mortgage payable Total availability of unsecured credit facility Line of credit amount Drawn down margin loan Debt maturity date Line of credit facility interest rate terms Line of credit facility related to accordion feature Total potential available under unsecured line of credit Maximum borrowing percentage of marketable securities Margin loan bearing interest rate Fixed Rate Mortgage Notes Payable Debt Issuance Costs Accumulated Amortization of Debt Issuance Costs Unamortized Debt Issuance Costs Weighted Average Interest Rate Schedule of Subsidiary or Equity Method Investee [Table] Subsidiary or Equity Method Investee [Line Items] Common stock, shares authorized Common stock, shares issued Common stock, shares outstanding Excess stock, shares authorized Percentage increase in common stock dividend Dividend declared per share Common stock dividend, description Increase in dividend period Dividend increase percentage Annualized dividend rate per share price Period of maintained or increased its cash dividend Cash raised from issuance of common stock under DRIP Amount of dividend reinvested Common stock issued under plan Cash dividends paid Share Repurchase Program authorizes amount Accrued dividend Annual rate of dividends cumulative and payable Preferred stock redemption price Maximum proceeds from issuance of sale of equity Number of preferred stock shares sold Weighted average exercise price per share Net proceeds from offering Fixed rate mortgage notes payable at fair value Fixed rate mortgage notes payable, net of unamortized debt issuance costs Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Cash paid for interest Contingencies and Commitments [Table] Contingencies and Commitments [Line Items] Area of buildings Weighted average lease maturity term Aggregate purchase price of industrial properties Mortgage loans amortization period Mortgage loans committed on real estate, carrying amount of mortgage Fixed interest rate, percentage Expected proceeds from sale of buildings Expected gain loss on sale of properties Expansion costs Increase in annualized rent Lease extension term from the date of completion Subsequent Event [Table] Subsequent Event [Line Items] Dividend declaration date Dividends payable, date to be paid Dividend payable date of record Preferred stock dividend rate, percentage 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] 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] Buckner, KY (Louisville) [Member] Buckner (Louisville), KY [Member] Buckner (Louisville) [Member] Buckner 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. CBL & 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] 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] December 31 [Member] Denver, CO [Member] Denver [Member] Dividend Distribution Four [Member] Dividend Distribution One [Member] Dividend Distribution Three [Member] Dividend Distribution Two [Member] Dividend rate in percentage of preferred stock. Dividend Reinvestment and Stock Purchase Plan [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. 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] 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] 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] Represents a settlement with former tenants for the early termination of a lease. 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 Notes Payable Fair Value [Member] Mortgage Notes Payable [Member] Mortgage Notes Payable Under Commitment [Member] New Orleans MSA [Member] Newington (Hartford), CT [Member] Newington (Hartford) [Member] Newington. O'Fallon member. O’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] PalmerTerraceRealtyAssociatesLLC [Member] Pennsylvania Real Estate Investment Trust [Member] Pittsburgh MSA [Member] 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] Ralcorp Holdings Inc. Renatable space. Rental And Reimbursement Revenue [Member] 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. Seattle/Everett MSA [Member] 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] 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] 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] 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] 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. Urbandale (Des Moines), IA [Member] Urbandale (Des Moines) [Member] Urbandale. Vacant Land [Member] Vice President of Investor Relations [Member] Waco [Member] Waco, TX [Member] 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. Proceeds from market preferred equity program. Summary of Range of Losses [Table Text Block] 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] 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] Orangeburg NY [Member] In-Place Leases [Member] 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] October 2, 2017 [Member] Series C Cumulative Redeemable Preferred Stock [Member] Preferred Stock ATM Program [Member] Underwritten Public Offering [Member] At-The-Market Offerings [Member] Five Lease [Member] Kansas City, MO (Kellogg) [Member] Orangeburg NY [Member] Monroe, NC [Member] White Bear Lake (Minneapolis/St. Paul), MN [Member] Acquired in-pace Leases [Member] New Buildings [Member] Edwardsville (Kansas City), KS (Carlisle Tire) [Member] Marcus Assosiates [Member] The net gain (loss) resulting from sales and other disposals of real estate owned for investment purposes. 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] Tampa (FDX) [Member] Mesquite, TX [Member] Aiken, SC [Member] Homestead, FL [Member] Orangeburg NY Kellogg [Member]. Another Ft. Myers, FL [Member] Covington, LA [Member] Ft. Myers, FL [Member] Summary of Consolidated Statements of Income for Properties Acquired [Table Text Block] Redemption of Series A Preferred Stock. July 31, 2018 [Member] February 28, 2018 [Member] Stock Options [Member] Industrial Buildings [Member] Shaw Industries, Inc [Member] January 22, 2018 [Member] Fiscal Year 2017 [Member] Expansion square feet. Acres of property. Percentage of building area leased. Lease term. Amount of acquisition cost of a business combination allocated to buildings included in real estate. Mortgage loan on real estate expiration period. Common and Preferred Stock [Member] Percentage of undepreciated assets investment marketable securities. Common stock shares purchases. Available for sale securities, Shares. Dividend rate of preferred stock held as security for loan. Securities 1 [Member] Securities 2 [Member] Securities Three [Member] Number of individual securities. Available for sale securities range of loss in percentage. One Mortgages Loans [Member] Mortgages Loans [Member] Two Mortgages Loans [Member] Mortgage loan amortizing over period. Maximum borrowing percentage of marketable securities. Dividend Reinvestment and Stock Purchase Plan [Member] January 24, 2018 [Member] Percentage increase in common stock dividend. Common stock dividend, description. Increase in dividend period. Annualized dividend rate per share price. Represent the period of cash dividend maintained. Amount of dividend reinvested. Net proceeds from offering. Contingencies and Commitments. Contingencies and Commitments. Investment Grade Tenants Or Subsidiaries [Member] Properties One [Member] Properties Two [Member] Weighted average lease maturity term. Business acquisition, purchase price allocation, property, plant and equipments. Mortgage loan amortization period. Common Shareholders [Member ] Series C Preferred Shareholders [Member] Kansas City, MO and Orangeburg, NY [Member] Dividend reinvestment and stock purchase plan cost, per share. Cash raised from issuance of common stock under DRIP. Amazon.com Services, Inc [Member] Securities Four [Member] Four Properties [Member] Four Lease [Member] Annualized average base rent per square foot. Percentage of undepreciated assets. Percentage of gain on properties. Net gain on historic cost undepreciated basis. Percentage of net gain over the historic cost basis. Percentage of weighted average lease termination income. Stock Options One [Member] Stock Options Two [Member] Date the equity-based award grant, in CCYY-MM-DD format. Share based compensation arrangement by share based payment award option price. Number of Employees. Estimated forfeitures of stock options. B. Braun Medical Inc [Member] Mortgage loan period. Cost of building expansion. Lease Expiration Date Description. Rent prior to expansion. Rent prior to expansion, per square foot. Rent increased to after expansion. Rent increased to after expansion, per square foot. Sale of industrial building. Square feet of real estate property leased. Percentage of real estate property leased. Percentage of rental space and tenant account description. Expected revenue as percentage of aggregate rental and reimbursement revenue in current fiscal year. Business Acquisitions Purchase Price Allocation Of Properties Acquired. Rental Revenue. Net Income Attributable to Common Shareholders. Business Acquisitions Pro Forma Rental And Reimbursement 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 loss 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. BusinessAcquisitionsProFormaNetLoss. Basic and Diluted Net Income per Share Attributable to Common Shareholders. Three Mortgages Loans [Member] April 2, 2018 [Member] Fixed interest rate, percentage. Lease extension term from the date of completion. Amount after tax of income (loss) from continuing operations before gain on sale of real estate investments. Potential lease termination income. Dividend increase percentage. Kansas City, MO (Kellogg) and Orangeburg [Member] Industrial Building One [Member] Industrial Building Two [Member] Amazon Fulfillment Services, Inc [Member] Building [Member] Real Estate Investment Property, at Cost Real Estate Investment Property, Accumulated Depreciation Real Estate Investment Property, Net Assets Liabilities Stockholders' Equity Attributable to Parent Liabilities and Equity Real Estate Revenue, Net Operating Expenses [Default Label] Interest Expense, Other Long-term Debt Nonoperating Income (Expense) IncomeLossFromContinuingOperationsBeforeGainOnSaleOfRealEstateInvestments Net Income (Loss) Attributable to Parent Net Income (Loss) Available to Common Stockholders, Basic Preferred Stock, Dividends, Per Share, Cash Paid Income (Loss) from Operations before Extraordinary Items, Per Diluted Share Granite City [Member] 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 Straight Line Rent Gain (Loss) on Sale of Securities, Net GainsLossesOnSalesOfInvestmentRealEstate1 Increase (Decrease) in Receivables Increase (Decrease) in Prepaid Expense and Other Assets Net Cash Provided by (Used in) Operating Activities Payments to Acquire and Develop Real Estate Payments for Capital Improvements Payments for Deposits on Real Estate Acquisitions Net Cash Provided by (Used in) Investing Activities Payments for Mortgage Deposits Payments of Financing Costs RedemptionOfSeriesPreferredStock Payments of Ordinary Dividends, Preferred Stock and Preference Stock Payments of Dividends Net Cash Provided by (Used in) Financing Activities Cash and Cash Equivalents, Period Increase (Decrease) Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Lessee, Leases [Policy Text Block] RentalRevenue Business Acquisitions Pro Forma Real Estate Taxes Business Acquisitions Pro Forma Operating Expenses Business Acquisitions Pro Forma Depreciation And Amortization Business Acquisitions Pro Forma Income Loss From Operations BusinessAcquisitionsProFormaLossOnSaleOfRealEstateInvestment BusinessAcquisitionsProFormaNetLoss Business Acquisition, Pro Forma Net Income (Loss) Sale of Stock, Price Per Share