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Note 6 - Exit and Disposal Activities - Summary of Pre-tax Restructuring Chargers (Details) - Transition of Production from the Broadway Plant [Member] - USD ($)
 9 Months Ended
Sep. 30, 2018
Oct. 01, 2017
Total Program $ 4,644,000  
Costs Incurred 1,088,000  
Recognized Costs 4,093,000  
Remaining Costs to be Recognized 551,000  
Employee Severance [Member]    
Total Program 1,350,000  
Costs Incurred 0 $ 1,017,000
Recognized Costs 1,350,000  
Remaining Costs to be Recognized 0  
Asset Impairment [Member]    
Total Program 188,000  
Costs Incurred 0  
Recognized Costs 188,000  
Remaining Costs to be Recognized 0  
Equipment Relocation Costs [Member]    
Total Program 1,804,000  
Costs Incurred 254,000 $ 1,218,000
Recognized Costs 1,678,000  
Remaining Costs to be Recognized 126,000  
Other Restructuring [Member]    
Total Program 1,302,000  
Costs Incurred 834,000  
Recognized Costs 877,000  
Remaining Costs to be Recognized $ 425,000