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Note 5 - Other Expense (Income), Net (Details Textual) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Other Nonoperating Income (Expense), Total $ (544,000) $ 1,256,000
Proceeds from Sale of Property, Plant, and Equipment, Total 1,969,000 1,858,000
Gain (Loss) on Disposition of Property Plant Equipment, Before Abandonment Gain (Loss) 813,000  
Assets Disposed of by Method Other than Sale, in Period of Disposition, Gain (Loss) on Disposition (577,000)  
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component 728,000 970,000
Gain Related to Settlement Agreement   1,500,000
Loss Contingency, Receivable, Proceeds   1,500,000
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property 236,000 654,000
Foreign Currency Transaction Gain (Loss), before Tax, Total   $ 152,000
Transition of Production from the Broadway Plant [Member]    
Proceeds from Sale of Property, Plant, and Equipment, Total 1,700,000  
Proceeds from Sale of Other Property, Plant, and Equipment $ 268,000