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Note 8 - Exit and Disposal Activities - Summary of Pre-tax Restructuring Chargers (Details) - Transition of Production from the Broadway Plant [Member] - USD ($)
 3 Months Ended
Mar. 31, 2019
Apr. 01, 2018
Total Program $ 4,887,000  
Costs Incurred 98,000  
Recognized Costs 4,499,000  
Remaining Costs to be Recognized 388,000  
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 1,895,000  
Costs Incurred 8,000 $ 68,000
Recognized Costs 1,793,000  
Remaining Costs to be Recognized 102,000  
Other Restructuring [Member]    
Total Program 1,454,000  
Costs Incurred 90,000 $ 441,000
Recognized Costs 1,168,000  
Remaining Costs to be Recognized $ 286,000