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Note 2 - Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2020
Notes Tables  
Property, Plant and Equipment Estimated Useful Lives [Table Text Block]
Class
 
Method
 
Estimated Useful
Lives (years)
  
               
Buildings & Improvements
  
Straight-line
  
10
to
40
  
Machinery and equipment
  
Straight-line
  
3
to
20
  
Tools and dies
  
Straight-line
  
 
3