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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 ($)
 9 Months Ended
Sep. 30, 2018
Oct. 01, 2017
Accrued, Beginning Balance $ 145,000  
Costs Incurred 1,088,000  
Cash Payments or Asset Write-Offs (1,233,000)  
Accrued, Ending Balance 0  
Employee Severance [Member]    
Accrued, Beginning Balance 145,000  
Costs Incurred 0 $ 1,017,000
Cash Payments or Asset Write-Offs (145,000)  
Accrued, Ending Balance 0  
Equipment Relocation Costs [Member]    
Accrued, Beginning Balance 0  
Costs Incurred 254,000 $ 1,218,000
Cash Payments or Asset Write-Offs (254,000)  
Accrued, Ending Balance 0  
Other Restructuring [Member]    
Accrued, Beginning Balance 0  
Costs Incurred 834,000  
Cash Payments or Asset Write-Offs (834,000)  
Accrued, Ending Balance $ 0