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Note 18 - Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2020
Notes Tables  
Schedule of Stockholders Equity [Table Text Block]
   
December 31,
 
   
2020
    
2019
  
Foreign currency translation adjustments, net of tax
   $
(10,847
 )   $
(10,623
 )
Employee benefit related adjustments – U.S, net of tax.
    
(13,867
 )    
(13,544
 )
Employee benefit related adjustments – Mexico, net of tax
    
16
      
116
  
Accumulated other comprehensive loss
   $
(24,698
 )   $
(24,051
 )
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
   
 
 
 
  
 
 
 
  
Accumulated
  
   
Foreign
    
Defined
    
Other
  
   
Currency
    
Benefit
    
Comprehensive
  
   
Translation
    
Plans
    
Loss
  
Balance at January 1, 2019
   $
(10,967
 )   $
(13,875
 )   $
(24,842
 )
Currency translation adjustments, net of tax
    
344
      
0
      
344
  
Net actuarial loss for the year, net of tax
    
0
      
(64
 )    
(64
 )
Amortization for the year, net of tax
    
0
      
511
      
511
  
Balance at December 31, 2019
   $
(10,623
 )   $
(13,428
 )   $
(24,051
 )
Currency translation adjustments, net of tax
    
(224
 )    
0
      
(224
 )
Net actuarial loss for the year, net of tax
    
0
      
(1,054
 )    
(1,054
 )
Amortization for the year, net of tax
    
0
      
631
      
631
  
Balance at December 31, 2020
   $
(10,847
 )   $
(13,851
 )   $
(24,698
 )