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Note 12 - Accumulated Other Comprehensive Loss (Tables)
 3 Months Ended
Mar. 31, 2020
Notes Tables  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
   
March 31,
    
December 31,
  
   
2020
    
2019
  
                 
Foreign currency translation adjustment, net of taxes of ($715) at March 31, 2020 and ($742) at December 31, 2019
   $
(22,277
 )   $
(20,032
 )
Unrealized holding gains on available-for-sale securities, net of taxes of $0 at March 31, 2020 and $0 at December 31, 2019
    
12
      
12
  
Unfunded SERP liability, net of taxes of ($619) at March 31, 2020 and ($639) at December 31, 2019
    
(3,979
 )    
(4,045
 )
                 
Accumulated other comprehensive loss
   $
(26,244
 )   $
(24,065
 )
Schedule of Changes in Accumulated Other Comprehensive Income (Loss) by Component [Table Text Block]
     
 
    
Unrealized Holding
      
 
  
 
    
 
  
   
Foreign Currency
    
Gains on
      
 
  
 
    
 
  
   
Translation
    
Available-for-
    
Unfunded
  
 
    
 
  
   
Adjustment
    
Sale Securities
    
SERP Liability
  
 
  
Total
  
                                   
Balance at December 31, 2019
   $
(20,032
 )   $
12
     $
(4,045
 )
 
   $
(24,065
 )
Other comprehensive (loss) income before reclassifications
    
(2,245
 )    
-
      
(169
 )
 
    
(2,414
 )
Amount reclassified from accumulated other comprehensive income (Loss)
    
-
      
-
      
235
  
(a)
    
235
  
Net current period other comprehensive income (loss)
    
(2,245
 )    
-
      
66
  
 
    
(2,179
 )
                                   
Balance at March 31, 2020
   $
(22,277
 )   $
12
     $
(3,979
 )
 
   $
(26,244
 )