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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. 29, 2019
Sep. 30, 2018
Total Program $ 5,041,000  
Costs Incurred 391,000  
Recognized Costs 4,792,000  
Remaining Costs to be Recognized 249,000  
Employee Severance [Member]    
Total Program 1,350,000  
Costs Incurred 0  
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 1,826,000  
Costs Incurred 38,000 $ 254,000
Recognized Costs 1,826,000  
Remaining Costs to be Recognized 0  
Other Restructuring [Member]    
Total Program 1,677,000  
Costs Incurred 353,000 $ 834,000
Recognized Costs 1,428,000  
Remaining Costs to be Recognized $ 249,000