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Note 18 - Accumulated Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
   
Unrealized Losses on Available-for-Sale Securities
    
Foreign Currency Translation Adjustments
    
Total
  
Balance as of January 1, 2017
   $
(1,023
 )   $
(3,192
 )   $
(4,215
 )
Other comprehensive income (loss) before reclassifications
    
(343
 )    
6,369
      
6,026
  
Amounts reclassified from accumulated other comprehensive income (loss)
    
2
      
-
      
2
  
Net current period other comprehensive income (loss)
    
(341
 )    
6,369
      
6,028
  
Balance as of December 31, 2017
    
(1,364
 )    
3,177
      
1,813
  
Other comprehensive loss before reclassifications
    
(549
 )    
(7,082
 )    
(7,631
 )
Amounts reclassified from accumulated other comprehensive income (loss)
    
66
      
-
      
66
  
Tax effect
    
209
      
-
      
209
  
Net current period other comprehensive loss
    
(274
 )    
(7,082
 )    
(7,356
 )
Balance as of December 31, 2018
   $
(1,638
 )   $
(3,905
 )   $
(5,543
 )