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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 ($)
 6 Months Ended
Jul. 01, 2018
Jul. 02, 2017
Accrued, Beginning Balance $ 145,000  
Costs Incurred 814,000  
Cash Payments or Asset Write-Offs (953,000)  
Accrued, Ending Balance 6,000  
Employee Severance [Member]    
Accrued, Beginning Balance 145,000  
Costs Incurred (13,000) $ 1,005,000
Cash Payments or Asset Write-Offs (126,000)  
Accrued, Ending Balance 6,000  
Equipment Relocation Costs [Member]    
Accrued, Beginning Balance 0  
Costs Incurred 224,000 $ 873,000
Cash Payments or Asset Write-Offs (224,000)  
Accrued, Ending Balance 0  
Other Restructuring [Member]    
Accrued, Beginning Balance 0  
Costs Incurred 603,000  
Cash Payments or Asset Write-Offs (603,000)  
Accrued, Ending Balance $ 0