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Critical Accounting Policy (Details)
 3 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Unusual or Infrequent Item, or Both [Line Items]      
Contract with Customer, Asset, Not Past Due $ 565,000   $ 888,000
Debt, Current $ 44,901,000   50,258,000
Number of Reporting Units 2    
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) $ (20,000) $ (24,000)  
Postemployment Benefits Liability 9,146,000   9,160,000
Self Insurance Reserve 961,000   1,203,000
Goodwill, Impairment Loss 0 0 $ 4,100,000
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount     19.00%
Asset Impairment Charges 0 $ 0  
Inventory Valuation Reserves 915,000   $ 898,000
Accounts Receivable, Allowance for Credit Loss 105,000   50,000
Deferred Tax Liabilities, Net     395,000
Accounts Receivable, Allowance for Chargebacks 368,000   476,000
Contract with Customer, Liability, Revenue Recognized 554,000    
Working Capital 13,350,000    
Income Taxes Receivable 6,193,000   $ 652,000
CARES Act [Member]      
Unusual or Infrequent Item, or Both [Line Items]      
Income Taxes Receivable $ 6,155,000