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Note 6 - Exit and Disposal Activities - Costs and Related Restructuring Reserves (Details) - Transition of Production from the Broadway Plant [Member] - USD ($)
 3 Months Ended
Apr. 01, 2018
Apr. 02, 2017
Accrued, Beginning Balance $ 145,000  
Costs Incurred 509,000  
Cash Payments or Asset Write-Offs (593,000)  
Accrued, Ending Balance 61,000  
Employee Severance [Member]    
Accrued, Beginning Balance 145,000  
Costs Incurred (13,000) $ 627,000
Cash Payments or Asset Write-Offs (71,000)  
Accrued, Ending Balance 61,000  
Equipment Relocation Costs [Member]    
Accrued, Beginning Balance 0  
Costs Incurred 68,000 $ 371,000
Cash Payments or Asset Write-Offs (68,000)  
Accrued, Ending Balance 0  
Other Restructuring [Member]    
Accrued, Beginning Balance 0  
Costs Incurred 454,000  
Cash Payments or Asset Write-Offs (454,000)  
Accrued, Ending Balance $ 0