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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 ($)
 6 Months Ended
Jul. 01, 2018
Jul. 02, 2017
Total Program $ 4,420,000  
Costs Incurred 814,000  
Recognized Costs 3,819,000  
Remaining Costs to be Recognized 601,000  
Employee Severance [Member]    
Total Program 1,350,000  
Costs Incurred (13,000) $ 1,005,000
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 1,793,000  
Costs Incurred 224,000 $ 873,000
Recognized Costs 1,648,000  
Remaining Costs to be Recognized 145,000  
Other Restructuring [Member]    
Total Program 1,089,000  
Costs Incurred 603,000  
Recognized Costs 633,000  
Remaining Costs to be Recognized $ 456,000