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Note 7 - Other (Income), Net (Details Textual) - USD ($)
 3 Months Ended 6 Months Ended
Jul. 05, 2020
Jun. 30, 2019
Jul. 05, 2020
Jun. 30, 2019
Proceeds from Sale of Property, Plant, and Equipment, Total     $ 1,968,000 $ 634,000
Proceeds from Sale of Other Property, Plant, and Equipment     268,000  
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property     958,000 477,000
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component $ 154,000 $ 333,000 402,000 495,000
Foreign Currency Transaction Gain (Loss), before Tax, Total     83,000  
Gain Related to Settlement Agreement   1,500,000   1,500,000
Other Current Assets [Member]        
Loss Contingency, Receivable, Ending Balance   $ 1,500,000   $ 1,500,000
Broadway Plant [Member]        
Proceeds from Sale of Property, Plant, and Equipment, Total     $ 1,700,000