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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 ($)
 3 Months Ended
Apr. 01, 2018
Apr. 02, 2017
Total Program $ 4,096,000  
Costs Incurred 509,000  
Recognized Costs 3,514,000  
Remaining Costs to be Recognized 582,000  
Employee Severance [Member]    
Total Program 1,350,000  
Costs Incurred (13,000) $ 627,000
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 1,552,000  
Costs Incurred 68,000 $ 371,000
Recognized Costs 1,492,000  
Remaining Costs to be Recognized 60,000  
Other Restructuring [Member]    
Total Program 1,006,000  
Costs Incurred 454,000  
Recognized Costs 484,000  
Remaining Costs to be Recognized $ 522,000