Quarterly Financial Information Disclosure [Abstract] Quarterly Financial Data (Unaudited) Quarterly Financial Information [Text Block] Earnings Per Share [Abstract] Schedule Of Earnings (Loss) Per Share, Basic And Diluted Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Accounting Policies [Abstract] Principles of Consolidation and Basis of Presentation Consolidation And Presentation, Policy [Policy Text Block] Consolidation And Presentation, Policy Revenue Recognition Revenue Recognition Accounting Policy, Gross and Net Revenue Disclosure [Policy Text Block] Cost of Sales and Distribution Cost of Sales, Policy [Policy Text Block] Advertising Costs Advertising Cost, Policy, Expensed Advertising Cost [Policy Text Block] Cash and Cash Equivalents and Investments in Certificates of Deposit Cash and Cash Equivalents, Policy [Policy Text Block] Inventories Inventory, Policy [Policy Text Block] Property, Plant and Equipment Property, Plant and Equipment, Policy [Policy 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Benefit Plan, Funded Status of Plan Unrecognized net actuarial loss Defined Benefit Plan, Unrecognized Net Actuarial Gain Loss Defined Benefit Plan, Unrecognized Net Actuarial Gain Loss Prepaid (accrued) benefit cost Prepaid Pension Costs Income Tax Disclosure [Abstract] Accounting for Uncertainty in Income Taxes Accounting For Uncetainty In Income Taxes [Text Block] Accounting For Uncetainty In Income Taxes [Text Block] 2018 Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months 2019 Defined Benefit Plan, Expected Future Benefit Payments, Year Two 2020 Defined Benefit Plan, Expected Future Benefit Payments, Year Three 2021 Defined Benefit Plan, Expected Future Benefit Payments, Year Four 2022 Defined Benefit Plan, Expected Future Benefit Payments, Year Five Years 2023-2027 Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter Net income Net Income (Loss) Attributable to Parent Denominator for basic earnings per common share - weighted-average shares Weighted Average Number of Shares Outstanding, Basic Stock options and restricted stock units Weighted Average Number Diluted Shares Outstanding Adjustment Denominator for diluted earnings (loss) per common share - weighted-average shares and assumed conversions Weighted Average Number of Shares Outstanding, Diluted Net earnings per share, Basic (usd per share) Earnings Per Share, Basic Net earnings per share, Diluted (usd per share) Earnings Per Share, Diluted Property, Plant and Equipment [Abstract] Property, Plant and Equipment Property, Plant and Equipment Disclosure [Text Block] Employee Benefit and Retirement Plans Pension and Other Postretirement Benefits Disclosure [Text Block] Statement of Stockholders' Equity [Abstract] Statement [Table] Statement [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common Stock [Member] Common Stock [Member] Retained Earnings [Member] Retained Earnings [Member] 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Issued During Period, Value, Stock Options Exercised Stock repurchases, shares Stock Repurchased and Retired During Period, Shares Stock repurchases Stock Repurchased and Retired During Period, Value Employee benefit plan contributions, shares Stock Issued During Period, Shares, Employee Benefit Plan Employee benefit plan contributions Stock Issued During Period, Value, Employee Benefit Plan Ending Balance, Shares Ending Balance Schedule of Defined Benefit Plans Disclosures [Table] Schedule of Defined Benefit Plans Disclosures [Table] Defined Benefit Plan, Asset Categories [Axis] Defined Benefit Plan, Asset Categories [Axis] Plan Asset Categories [Domain] Plan Asset Categories [Domain] Cash and Cash Equivalents [Member] Cash and Cash Equivalents [Member] Equity Funds [Member] Equity Funds [Member] Mutual Fund Equity [Member] Mutual Fund Equity [Member] Mutual Fund Equity [Member] Fixed Income Funds [Member] Fixed Income Funds [Member] Mutual Fund Income Tax [Member] Mutual Fund Income 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Future Employer Contributions in Next Fiscal Year Plan asset actual allocation Defined Benefit Plan, Actual Plan Asset Allocations Commitments and Contingencies Disclosure [Abstract] Movement in Standard Product Warranty Accrual [Roll Forward] Movement in Standard Product Warranty Accrual [Roll Forward] Beginning balance Standard Product Warranty Accrual Accrual for warranties Standard Product Warranty Accrual, Increase for Warranties Issued Settlements Standard Product Warranty Accrual, Decrease for Payments Ending balance at fiscal year end Reconciliation Of Warranty Liability Schedule of Product Warranty Liability [Table Text Block] Schedule Of Minimum Rental Requirements Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] Document And Entity Information [Abstract] Document And Entity Information Abstract Document Type Document Type Document Period End Date Document Period End Date Amendment Flag Amendment Flag Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Trading Symbol Trading Symbol Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Entity Current Reporting Status Entity Current Reporting Status Entity Voluntary Filers Entity Voluntary Filers Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Entity Public Float Entity Public Float Credit Concentration Concentration Risk Disclosure [Text Block] Debt Disclosure [Abstract] Schedule Of Debt Maturities Schedule of Maturities of Long-term Debt [Table Text Block] Summary Of Significant Accounting Policies [Table] Summary Of Significant Accounting Policies [Table] Summary Of Significant Accounting Policies [Table] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Long-term Debt [Member] Long-term Debt [Member] Other Noncurrent Assets [Member] Other Noncurrent Assets [Member] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Buildings And Improvements [Member] Building and Building Improvements [Member] Machinery And Equipment [Member] Machinery and Equipment [Member] Promotional Display [Member] Furniture and Fixtures [Member] Adjustments for New Accounting Pronouncements [Axis] Adjustments for New Accounting Pronouncements [Axis] Type of Adoption [Domain] Type of Adoption [Domain] ASU 2015-03 [Member] Accounting Standards Update 2015-03 [Member] ASU 2016-09, Statutory Tax Withholding Component [Member] Accounting Standards Update 2016-09, Statutory Tax Withholding Component [Member] Accounting Standards Update 2016-09, Statutory Tax Withholding Component [Member] Summary Of Significant Accounting Policies [Line Items] Summary Of Significant Accounting Policies [Line Items] Summary Of Significant Accounting Policies [Line Items] Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Amount Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Amount Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Amount Advertising costs Advertising Expense Cash equivalents Cash Equivalents, at Carrying Value Property, plant and equipment useful lives Property, Plant and Equipment, Useful Life Impairment of long-lived assets Impairment of Long-Lived Assets Held-for-use Amortization Amortization Cash flows from operating activities Net Cash Provided by (Used in) Operating Activities Cash flows from financing activities Net Cash Provided by (Used in) Financing Activities Debt issuance costs Debt Issuance Costs, Net Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Weighted-average fair value of grants Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Expected volatility Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Weighted Average Volatility Rate Expected term in years Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Risk-free interest rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Expected dividends yield Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Schedule Of Income Tax Expense Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Schedule Of Effective Income Tax Rate Reconciliation Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Schedule 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Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Income tax expense Income Tax Expense (Benefit) Net Income Earnings per share Basic (usd per share) Diluted (usd per share) Expected return on plan assets Defined Benefit Plan, Expected Return on Plan Assets Recognized net actuarial loss Defined Benefit Plan Recognized Net Actuarial Gain Loss Defined Benefit Plan Recognized Net Actuarial Gain Loss Pension benefit cost Defined Benefit Plan, Net Periodic Benefit Cost Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Land [Member] Land [Member] Building And Improvements - Capital Leases [Member] Building And Improvements Capital Leases [Member] Building And Improvements Capital Leases [Member] Machinery And Equipment - Capital Leases [Member] Machinery And Equipment Capital Leases [Member] Machinery And Equipment Capital Leases [Member] Construction In Progress [Member] Construction in Progress [Member] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Property, plant and equipment, gross Property, Plant and Equipment, Gross Less accumulated amortization and depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Property, Plant and Equipment, Net, Total Property, Plant and Equipment, Net Amortization and depreciation expense on property, plant and equipment Other Depreciation and Amortization Accumulated amortization on capital leases Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation Tax Credit Carryforward [Table] Tax Credit Carryforward [Table] Tax Credit Carryforward [Axis] Tax Credit Carryforward [Axis] Tax Credit Carryforward, Name [Domain] Tax Credit Carryforward, Name [Domain] Investment Tax Credit Carryforward [Member] Investment Tax Credit Carryforward [Member] Income Tax Authority [Axis] Income Tax Authority [Axis] Income Tax Authority [Domain] Income Tax Authority [Domain] State [Member] State and Local Jurisdiction [Member] Other Liabilities [Member] Other Liabilities [Member] Tax Credit Carryforward [Line Items] Tax Credit Carryforward [Line Items] Decrease in valuation allowance Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount Gross amount of state tax credit carryforwards Tax Credit Carryforward, Amount Net deferred tax assets related to tax credit carryforwards Deferred Tax Assets, Tax Credit Carryforwards, Net Deferred Tax Assets, Tax Credit Carryforwards, Net Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Lender Name [Axis] Lender Name [Axis] Line of Credit Facility, Lender [Domain] Line of Credit Facility, Lender [Domain] Wells Fargo [Member] Wells Fargo [Member] Wells Fargo [Member] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Eligible Accounts Receivable [Member] Eligible Accounts Receivable [Member] Eligible Accounts Receivable [Member] Eligible Pre Bill Reserves [Member] Eligible Pre Bill Reserves [Member] Eligible Pre Bill Reserves [Member] Equipment Value [Member] Equipment Value [Member] Equipment Value [Member] Board Of County Commissioners Of Garrett County [Member] Board Of County Commissioners Of Garrett County [Member] Board Of County Commissioners Of Garrett County [Member] Allegany County, Maryland Site [Member] Allegany County Maryland Site [Member] Allegany County, Maryland Site [Member] First American Financial Bancorp [Member] First American Financial Bancorp [Member] First American Financial Bancorp [Member] e-Plus Group [Member] E Plus Group [Member] e-Plus Group [Member] West Virginia Economic Development Authority [Member] West Virginia Economic Development Authority [Member] West Virginia Economic Development Authority [Member] West Virginia Economic Development Authority, Originated in 2015 [Member] West Virginia Economic Development Authority, 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improvements Debt Instrument, Collateral Amount Accrued interest Interest Payable Loss on loan settlement Gain (Loss) on Extinguishment of Debt Debt, outstanding balance Long-term Debt and Capital Lease Obligations, Including Current Maturities Number of loan agreements Number Of Loan Agreements Number Of Loan Agreements Number of capitalized lease agreements Number Of Capitalized Lease Agreements Number Of Capitalized Lease Agreements Capital lease obligations incurred Capital Lease Obligations Incurred Capital lease term Capital Lease Term Capital Lease Term Market interest rate Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate Capital lease agreement Capital Lease Obligations Loan agreement amount Debt Instrument, Face Amount Debt instrument, interest rate, stated percentage Debt Instrument, Interest Rate, Stated Percentage New Markets Tax Credit Investment New Markets Tax Credit Investment New Markets Tax Credit Investment Notes, Loans and Financing Receivable, Net, Noncurrent Notes, Loans and Financing Receivable, Net, Noncurrent Loan term Debt Instrument, Term Amount drawn on loan Loans Payable New Markets Tax Credit, Recapture Period New Markets Tax Credit, Recapture Period New Markets Tax Credit, Recapture Period Deferred Finance Costs, Amortization Period Deferred Finance Costs, Amortization Period Deferred Finance Costs, Amortization Period Interest paid under agreement and capital leases Interest Expense, Long-term Debt CURRENT EXPENSE Current Income Tax Expense (Benefit), Continuing Operations [Abstract] Federal Current Federal Tax Expense (Benefit) State Current State and Local Tax Expense (Benefit) Total current expense Current Income Tax Expense (Benefit) DEFERRED EXPENSE Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] Federal Deferred Federal Income Tax Expense (Benefit) State Deferred State and Local Income Tax Expense (Benefit) Total deferred expense Deferred Income Tax Expense (Benefit) Total expense 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Other than Options, Forfeited in Period Issued and outstanding, ending balance Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Weighted average grant date fair value, beginning balance Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Weighted average grant date fair value, Awarded Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Weighted average grant date fair value, cancelled due to non-achievement of performance goals Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options, Cancelled Weighted Average Grant Date Fair Value Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options, Cancelled Weighted Average Grant Date Fair Value Weighted average grant date fair value, settled in common shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Weighted average grant date fair value, forfeited Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Weighted average grant date fair value, ending balance Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table] Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table] Exercise Price Range [Axis] Exercise Price Range [Axis] Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Domain] Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Domain] $22.77 - $23.96 [Member] Price Range One [Member] Price Range One [Member] $29.92- $34.11 [Member] Price Range Two [Member] Price Range Two [Member] $57.11 [Member] Price Range Three [Member] Price Range Three [Member] Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] Option price per share, lower range limit Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit Option price per share, upper range limit Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit Options outstanding Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options Options outstanding remaining life Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Remaining Contractual Term Options outstanding exercise price Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Exercise Price Options exercisable Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Exercisable Options Options exercisable exercise price Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Exercise Price Inventory Disclosure [Abstract] Raw materials Inventory, Raw Materials, Gross Work-in-process Inventory, Work in Process, Gross Finished goods Inventory, Finished Goods, Gross Total FIFO inventories FIFO Inventory Amount Reserve to adjust inventories to LIFO value Inventory, LIFO Reserve Total LIFO inventories LIFO Inventory Amount Reconciliation Of Benefit Obligations, Plan Assets, And Funded Status Schedule Of Postretirement Benefit Obligations Plan Assets And Funded Status [Table Text Block] Schedule Of Postretirement Benefit Obligations Plan Assets And Funded Status Net Periodic Pension Cost Schedule of Net Benefit Costs [Table Text Block] Schedule Of Assumptions Used To Determine Benenfit Obligations And Earnings Effects For Pension Plans Schedule of Assumptions Used [Table Text Block] Schedule Of Expected Future Benefit Payments Schedule of Expected Benefit Payments [Table Text Block] Schedule Of Pension Assets By Major Category Of Plan Assets And Type Of Fair Value Measurements Schedule of Pension Assets By Major Category Of Plan Assets And Type of Fair Value Measurement [Table Text Block] Schedule of Pension Assets By Major Category Of Plan Assets And Type of Fair Value 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Allocation of Recognized Period Costs [Line Items] Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] Stock-based compensation expense, before income taxes Allocated Share-based Compensation Expense Inventories Inventory Disclosure [Text Block] Revolving Credit Facility [Member] Revolving Credit [Member] Revolving Credit [Member] Economic Development Loans [Member] Economic [Member] Economic [Member] Capital Lease Obligations [Member] Capital Lease [Member] Capital Lease [Member] Other Long-term Debt [Member] Other Long-Term Debt [Member] Other Long-Term Debt [Member] 2018 Long-term Debt and Capital Lease Obligations, Repayments of Principal in Next Twelve Months 2019 Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Two 2020 Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Three 2021 Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Four 2022 Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Five 2023 and thereafter Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal after Year Five Total Less current maturities Long-term Debt and Capital Lease Obligations, Current Total long-term debt Long-term Debt and Capital Lease Obligations Federal statutory rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Research and experimentation tax credit Effective Income Tax Rate Reconciliation, Tax Credit, Research, Percent Stock Compensation Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Percent Meals and entertainment Effective Income Tax Rate Reconciliation, Nondeductible Expense, Meals and Entertainment, Percent Domestic production deduction Effective Income Tax Rate Reconciliation, Nondeductible Expense, Domestic Production Deduction, Percent Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to domestic production deduction. Other Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Percent Total Effective Income Tax Rate Reconciliation, Total Adjustments To Federal Statutory Rate Effective Income Tax Rate Reconciliation, Total Adjustments To Federal Statutory Rate Effective federal income tax rate Effective Income Tax Rate Reconciliation, Effective Federal Income Tax Rate Effective Income Tax Rate Reconciliation, Effective Federal Income Tax Rate State income taxes, net of federal tax effect Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent Effective income tax rate Effective Income Tax Rate Reconciliation, Percent Income taxes paid Income Taxes Paid, Net Deferred tax assets: Deferred Tax Assets, Gross [Abstract] Pension benefits Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Pensions Accounts receivable Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts Product liability Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Warranty Reserves Employee benefits Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Benefits State tax credit carryforwards Deferred Tax Assets, Tax Credit Carryforwards Other Deferred Tax Assets, Other Gross deferred tax assets, before valuation allowance Deferred Tax Assets, Gross Valuation allowance Deferred Tax Assets, Valuation Allowance Gross deferred tax assets, after valuation allowance Deferred Tax Assets, Net of Valuation Allowance Deferred tax liabilities: Deferred Tax Liabilities, Gross [Abstract] Inventory Deferred Tax Liabilities, Inventory Depreciation Deferred Tax Liabilities Deferred Expense Capitalized Depreciation Deferred Tax Liabilities Deferred Expense Capitalized Depreciation Total Deferred Tax Liabilities, Gross Net deferred tax asset Deferred Tax Assets, Net Fair Value Disclosures [Abstract] Fair Value Measurements Fair Value Disclosures [Text Block] Earnings Per Share Earnings Per Share [Text Block] Components Of Property, Plant And Equipment Property, Plant and Equipment [Table Text Block] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Asset Class [Axis] Asset Class [Axis] Fair Value by Asset Class [Domain] Asset Class [Domain] Money Market Funds [Member] Money Market Funds [Member] Mutual Funds [Member] Mutual Funds [Member] Mutual Funds [Member] Certificates of Deposit [Member] Certificates of Deposit [Member] LEVEL 1 [Member] LEVEL 2 [Member] LEVEL 3 [Member] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Total assets at fair value Assets, Fair Value Disclosure, Recurring Concentration Risk [Table] Concentration Risk [Table] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Accounts Receivable [Member] Accounts Receivable [Member] Sales Revenue, Gross [Member] Sales Revenue Gross [Member] Revenue from sale of goods and services rendered, in the normal course of business, before sales returns and allowances, and sales discounts, when it serves as a benchmark in a concentration of risk calculation. Customer [Axis] Customer [Axis] Customer [Domain] Customer [Domain] Customer A [Member] Customer A [Member] Customer A [Member] Customer B [Member] Customer B [Member] Customer B [Member] Concentration Risk [Line Items] Concentration Risk [Line Items] Concentration risk percentage Concentration Risk, Percentage Commitments And Contingencies [Table] Commitments And Contingencies [Table] Commitments And Contingencies [Table] Related Party [Axis] Related Party [Axis] Related Party [Domain] Related Party [Domain] Significant Shareholders [Member] Majority Shareholder [Member] Commitments And Contingencies [Line Items] Commitments And Contingencies [Line Items] Commitments And Contingencies [Line Items] Warranty claims, period from original ship date Warranty Claims, Period From Original Ship Date Warranty Claims, Period From Original Ship Date Total rental expenses Operating Leases, Rent Expense, Minimum Rentals Rent agreement term Rent Agreement Term Rent Agreement Term Reltaed party rent expense Related Party Transaction, Expenses from Transactions with Related Party Rent expense from remaining term Rent Expense From Remaining Term Rent Expense From Remaining Term Receivables [Abstract] Gross customer receivables Accounts Receivable, Gross, Current Allowance for doubtful accounts Allowance for Doubtful Accounts Receivable, Current Allowance for returns and discounts Allowance For Returns And Discounts Allowance for returns and discounts Net customer receivables Accounts Receivable, Net, Current Components Of Customer Receivables Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Non Employee Directors [Member] Non Employee Directors [Member] Non Employee Directors [Member] Employees [Member] Employees [Member] Employees [Member] Stock Options [Member] Employee Stock Option [Member] Employee And Non Employee Director Service Based Restricted Stock Units [Member] Employee And Non Employee Director Service Based Restricted Stock Units [Member] Employee And Non Employee Director Service Based Restricted Stock Units [Member] Performance-Based Restricted Stock Tracking Units (RSTUs) [Member] Performance Based Restricted Stock Tracking Units Rstus [Member] Performance-Based Restricted Stock Tracking Units (RSTUs) [Member] Service-Based Restricted Stock Tracking Units (RSTUs) [Member] Service Based Restricted Stock Tracking Units Rstus [Member] Service-Based Restricted Stock Tracking Units (RSTUs) [Member] Restricted Stock Tracking Units (RSTUs) [Member] Restricted Stock Tracking Units Rstus [Member] Restricted Stock Tracking Units (RSTUs) [Member] Number of stock-based compensation plans Number Of Stock Based Compensation Plans Number Of Stock Based Compensation Plans Number of stock incentive plans Share-based Compensation Arrangement by Share-based Payment Award, Number of Plans Share-based Compensation Arrangement by Share-based Payment Award, Number of Plans Shares available for awards Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Contractual terms, years Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Vesting period, years Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Total fair value of options vested Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value Total unrecognized compensation expense related to unvested stock options granted Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options Expected to be recognized over a weighted average period Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Cash received from options exercised Proceeds from Stock Options Exercised Tax benefit realized from the tax deduction from option exercises Employee Service Share-based Compensation, Tax Benefit from Compensation Expense Shares approved for grants Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Accrued compensation and related expenses Employee-related Liabilities, Current ASSETS Assets [Abstract] Current Assets Assets, Current [Abstract] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Investments - certificates of deposit Certificates of Deposit, at Carrying Value Customer receivables, net Inventories Inventory, Net Prepaid expenses and other Prepaid Expense and Other Assets, Current Total Current Assets Assets, Current Property, plant and equipment, net Certificates of Deposit, Noncurrent Certificates of Deposit, Noncurrent Certificates of Deposit, Noncurrent Promotional displays, net Promotional Displays Net Promotional displays net Deferred income taxes Deferred Income Tax Assets, Net Other assets Other Assets, Noncurrent TOTAL ASSETS Assets LIABILITIES AND SHAREHOLDERS' EQUITY Liabilities and Equity [Abstract] Current Liabilities Liabilities, Current [Abstract] Accounts payable Accounts Payable, Current Current maturities of long-term debt Accrued marketing expenses Accrued Marketing Costs, Current Other accrued expenses Other Accrued Liabilities, Current Total Current Liabilities Liabilities, Current Long-term debt, less current maturities Defined benefit pension liabilities Defined Benefit Pension Plan, Liabilities, Noncurrent Other long-term liabilities Other Liabilities, Noncurrent Shareholders' Equity Stockholders' Equity Attributable to Parent [Abstract] Preferred stock, $1.00 par value; 2,000,000 shares authorized, none issued Preferred Stock, Value, Issued Common stock, no par value; 40,000,000 shares authorized; issued and outstanding shares: at April 30, 2017: 16,232,775, at April 30, 2016: 16,244,041 Common Stock, Value, Issued Retained earnings Retained Earnings (Accumulated Deficit) Accumulated other comprehensive loss - Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Defined benefit pension plans Total Shareholders' Equity TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY Liabilities and Equity Fair Value Of Assets On Recurring Basis Fair Value, Assets Measured on Recurring Basis [Table Text Block] Customer Receivables Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Stock-Based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Statement of Cash Flows [Abstract] OPERATING ACTIVITIES Net Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net income to net cash and cash equivalents provided by operating activities: Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation and amortization Depreciation, Depletion and Amortization Net loss on disposal of property, plant and equipment Gain (Loss) on Disposition of Property Plant Equipment Gain on sales of assets held for sale Gain (Loss) on Sale of Properties Stock-based compensation expense Share-based Compensation Deferred income taxes Pension contributions in excess of expense Pension Contributions Excess tax benefit from stock-based compensation Excess Tax Benefit from Share-based Compensation, Operating Activities Contributions of employer stock to employee benefit plan Employee Benefit Plan, Stock Expense Employee Benefit Plan, Stock Expense Other non-cash items Other Noncash Income (Expense) Changes in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Customer receivables Increase (Decrease) in Accounts Receivable Inventories Increase (Decrease) in Inventories Prepaid expenses and other assets Increase (Decrease) in Prepaid Expense and Other Assets Accounts payable Increase (Decrease) in Accounts Payable Accrued compensation and related expenses Increase (Decrease) in Employee Related Liabilities Income taxes payable Increase (Decrease) in Income Taxes Payable Marketing and other accrued expenses Increase (Decrease) in Accrued Liabilities and Other Operating Liabilities Net Cash Provided by Operating Activities INVESTING ACTIVITIES Net Cash Provided by (Used in) Investing Activities [Abstract] Payments to acquire property, plant, and equipment Payments to Acquire Property, Plant, and Equipment Proceeds from sales of property, plant, and equipment Proceeds from Sale of Property, Plant, and Equipment Proceeds from sales of assets held for sale Proceeds from Sale of Property Held-for-sale Purchases of certificates of deposit Payments to Acquire Short-term Investments Proceeds from Maturities, Prepayments and Calls of Short-term Investments Proceeds from Maturities, Prepayments and Calls of Short-term Investments Investment in promotional displays Payments to Acquire Other Productive Assets Net Cash Used by Investing Activities Net Cash Provided by (Used in) Investing Activities FINANCING ACTIVITIES Net Cash Provided by (Used in) Financing Activities [Abstract] Payments of long-term debt Repayments of Long-term Debt Proceeds from long-term debt Proceeds from Issuance of Long-term Debt Excess tax benefit from stock-based compensation Excess Tax Benefit from Share-based Compensation, Financing Activities Proceeds from issuance of common stock and other Proceeds from Issuance of Common Stock Repurchase of common stock Payments for Repurchase of Common Stock Withholding of employee taxes related to stock-based compensation Payments Related to Tax Withholding for Share-based Compensation Notes receivable, net Increase (Decrease) in Long-term Receivables, Current Net Cash Provided (Used) by Financing Activities Net Increase in Cash And Cash Equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash And Cash Equivalents, Beginning of Year Cash And Cash Equivalents, End of Year Gross profit Income before income taxes Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Schedule Of Quarterly Financial Information Quarterly Financial Information [Table Text Block] Defined Benefit Plans and Other Postretirement Benefit Plans [Axis] Defined Benefit Plans and Other Postretirement Benefit Plans [Axis] Defined Benefit Plan and Other Postretirement Benefit Plan [Domain] Defined Benefit Plan and Other Postretirement Benefit Plan [Domain] Pension Plan, Defined Benefit [Member] Pension Plan [Member] Discount rate Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate Expected return on plan assets Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets 2018 Operating Leases, Future Minimum Payments Due, Next Twelve Months 2019 Operating Leases, Future Minimum Payments, Due in Two Years 2020 Operating Leases, Future Minimum Payments, Due in Three Years 2021 Operating Leases, Future Minimum Payments, Due in Four Years 2022 Operating Leases, Future Minimum Payments, Due in Five Years 2023 (and thereafter) Operating Leases, Future Minimum Payments, Due Thereafter Total, Operating Operating Leases, Future Minimum Payments Due Capital Leases, Future Minimum Payments, Net Present Value [Abstract] Capital Leases, Future Minimum Payments, Net Present Value [Abstract] 2018 Capital Leases, Future Minimum Payments Due, Next Twelve Months 2019 Capital Leases, Future Minimum Payments Due in Two Years 2020 Capital Leases, Future Minimum Payments Due in Three Years 2021 Capital Leases, Future Minimum Payments Due in Four Years 2022 Capital Leases, Future Minimum Payments Due in Five Years 2023 (and thereafter) Capital Leases, Future Minimum Payments Due Thereafter Total, Capital Capital Leases, Future Minimum Payments Due Less amounts representing interest (2%) Capital Leases, Future Minimum Payments, Interest Included in Payments Total obligations under capital leases Capital Leases, Future Minimum Payments, Present Value of Net Minimum Payments Schedule of Capital Leased Assets [Table] Schedule of Capital Leased Assets [Table] Capital Leased Assets [Line Items] Capital Leased Assets [Line Items] Capital leases, interest rate, effective percentage Capital Leases of Lessee, Contingent Rentals, Interest Rate, Effective Percentage Capital Leases of Lessee, Contingent Rentals, Interest Rate, Effective Percentage Loans Payable and Long-Term Debt Debt and Capital Leases Disclosures [Text Block] Potentially dilutive shares Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Schedule II - Valuation and Qualifying Accounts Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] Components Of Inventories Schedule of Inventory, Current [Table Text Block] Schedule Of Weighted Average Assumptions And Valuation Of Stock Options Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Schedule Of Stock Option Activity Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] Schedule Of Stock Options Oustanding Activity Schedule Of Share Based Compensation Stock Options Outstanding Activity [Table Text Block] Schedule Of Share Based Compensation Stock Options Outstanding Activity Summary Of RSU's Activity Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] Stock-Based Compensation Expense Allocated Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Oustanding number of options, Beginning Balance Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Options granted Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Options exercised Options cancelled or expired Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period Oustanding number of options ending balance Remaining contractual term outstanding Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Remaining contractual term, granted Share Based Compensation Arrangement By Sharebased Payment Award Options Granted Weighted Average Remaining Contractual Term Share Based Compensation Arrangement By Sharebased Payment Award Options Granted Weighted Average Remaining Contractual Term Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Exercise price, beginning Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Exercise price, granted Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Exercise price, exercised Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Exercise price, cancelled or expired Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price Exercise price, ending Aggregate intrinsic value outstanding, beginning balance Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Aggregate intrinsic value, exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value Aggregate intrinsic value outstanding, ending balance Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Abstract] Vested and expected to vest in the future, Number of options Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number Vested and expected to vest in the future, Remaining contractual term Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term Vested and expected to vest in the future, Exercise price Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price Vested and expected to vest in the future, Aggregate intrinsic value Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value Exercisable, Number of options Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Exercisable, Remaining contractual term Exercisable, Exercise price Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Exercisable, Aggregate intrinsic value Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value