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Note 7 - Other Expense (Income), Net (Details Textual) - USD ($)
 3 Months Ended 9 Months Ended
Oct. 04, 2020
Sep. 29, 2019
Oct. 04, 2020
Sep. 29, 2019
Proceeds from Sale of Property, Plant, and Equipment, Total     $ 1,969,000 $ 653,000
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     813,000 467,000
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component $ 201,000 $ 248,000 603,000 743,000
Foreign Currency Transaction Gain (Loss), before Tax, Total     73,000  
Gain Related to Settlement Agreement       $ 1,500,000
Loss Contingency, Receivable, Proceeds   $ 1,500,000    
Broadway Plant [Member]        
Proceeds from Sale of Property, Plant, and Equipment, Total     $ 1,700,000