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Note 19 - Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Stockholders Equity [Table Text Block]
   
December 31,
  
   
2017
    
2016
  
Foreign currency translation adjustments, net of tax
   $
(10,915
 )   $
(11,334
 )
Employee benefit related adjustments
– U.S, net of tax.
    
(14,748
 )    
(15,445
 )
Employee benefit related adjustments
– Mexico, net of tax
    
112
      
181
  
Accumulated other comprehensive loss
   $
(25,551
 )   $
(26,598
 )
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
   
 
 
 
  
 
 
 
  
Accumulated
  
   
Foreign
    
Defined
    
Other
  
   
Currency
    
Benefit
    
Comprehensive
  
   
Translation
    
Plans
    
Loss
  
Balance at January 1, 2016
   $
(9,554
 )   $
(16,206
 )   $
(25,760
 )
Currency translation adjustments
    
(1,780
 )    
0
      
(1,780
 )
Net actuarial gain for the year
    
0
      
164
      
164
  
Amortization for the year
    
0
      
778
      
778
  
Balance at December 31, 2016
    
(11,334
 )    
(15,264
 )    
(26,598
 )
Currency translation adjustments
    
419
      
0
      
419
  
Net actuarial gain for the year
    
0
      
205
      
205
  
Amortization for the year
    
0
      
423
      
423
  
Balance at December 31, 2017
   $
(10,915
 )   $
(14,636
 )   $
(25,551
 )