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Critical Accounting Policy (Details)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Mar. 31, 2020
USD ($)
Unusual or Infrequent Item, or Both [Line Items]            
Contract with Customer, Asset, Not Past Due $ 61,000   $ 61,000   $ 888,000  
Debt, Current 36,167,000   $ 36,167,000   50,258,000  
Number of Reporting Units     2      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) (20,000) $ (24,000) $ (40,000) $ (48,000)    
Postemployment Benefits Liability 9,187,000   9,187,000   9,160,000  
Self Insurance Reserve 901,000   901,000   1,203,000  
Goodwill, Impairment Loss     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 823,000   823,000   $ 898,000  
Accounts Receivable, Allowance for Credit Loss 109,000   109,000   50,000  
Accounts Receivable, Allowance for Chargebacks 148,000   148,000   476,000  
Contract with Customer, Liability, Revenue Recognized     729,000      
Working Capital 12,345,000   12,345,000      
Income Taxes Receivable 6,870,000   6,870,000   $ 652,000  
Government Grant     1,391,000      
CARES Act [Member]            
Unusual or Infrequent Item, or Both [Line Items]            
Income Taxes Receivable $ 5,688,000   $ 5,688,000     $ 6,155,000