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Note 5 - Other Income, Net (Details Textual) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Other Nonoperating Income (Expense), Total $ 1,256,000 $ 1,436,000
Gain Related to Settlement Agreement 1,500,000  
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property 654,000 (249,000)
Foreign Currency Transaction Gain (Loss), before Tax, Total 152,000 21,000
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component 970,000 584,000
Proceeds from Insurance Settlement, Investing Activities   2,447,000
Gain on Business Interruption Insurance Recovery 0 $ 2,275,000
Other Current Assets [Member]    
Loss Contingency, Receivable, Ending Balance $ 1,500,000