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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, 2018
Dec. 31, 2017
Total Program $ 4,801,000  
Costs Incurred 1,394,000  
Recognized Costs 4,401,000  
Remaining Costs to be Recognized 400,000  
Employee Severance [Member]    
Total Program 1,350,000  
Costs Incurred 0 $ 936,000
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 1,955,000  
Costs Incurred 361,000 $ 1,424,000
Recognized Costs 1,785,000  
Remaining Costs to be Recognized 170,000  
Other Restructuring [Member]    
Total Program 1,308,000  
Costs Incurred 1,033,000  
Recognized Costs 1,078,000  
Remaining Costs to be Recognized $ 230,000