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Note 14 - Accumulated Other Comprehensive Income (Loss) (Tables)
 6 Months Ended
Jun. 30, 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, 2018
   $
(1,364
 )   $
3,177
     $
1,813
  
Other comprehensive income (loss) before reclassifications
    
(1,185
 )    
4,389
      
3,204
  
Amounts reclassified from accumulated other comprehensive income
    
25
      
-
      
25
  
Net current period other comprehensive income (loss)
    
(1,160
 )    
4,389
      
3,229
  
Balance as of March 31, 2018
    
(2,524
 )    
7,566
      
5,042
  
Other comprehensive income (loss) before reclassifications
    
94
      
(6,862
 )    
(6,768
 )
Amounts reclassified from accumulated other comprehensive income (loss)
    
21
      
-
      
21
  
Net current period other comprehensive income (loss)
    
115
      
(6,862
 )    
(6,747
 )
Balance as of June 30, 2018
   $
(2,409
 )   $
704
     $
(1,705
 )