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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
Jun. 30, 2019
Jul. 01, 2018
Total Program $ 4,978,000  
Costs Incurred 201,000  
Recognized Costs 4,602,000  
Remaining Costs to be Recognized 376,000  
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 1,793,000  
Costs Incurred 8,000 $ 224,000
Recognized Costs 1,793,000  
Remaining Costs to be Recognized 0  
Other Restructuring [Member]    
Total Program 1,647,000  
Costs Incurred 193,000 $ 590,000
Recognized Costs 1,271,000  
Remaining Costs to be Recognized $ 376,000