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Note 4 - Exit and Disposal Activities - Summary of Pre-tax Restructuring Chargers (Details) - Transition of Production from the Broadway Plant [Member] - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Total Program $ 4,973,000  
Costs Incurred 509,000  
Recognized Costs 4,910,000  
Remaining Costs to be Recognized 63,000  
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 $ 361,000
Recognized Costs 1,826,000  
Remaining Costs to be Recognized 0  
Other Restructuring [Member]    
Total Program 1,609,000  
Costs Incurred 471,000 $ 1,033,000
Recognized Costs 1,546,000  
Remaining Costs to be Recognized $ 63,000