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Note 18 - Accumulated Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2017
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, 2016
   $
(375
 )   $
1,841
     $
1,466
  
Other comprehensive loss before reclassifications
    
(623
 )    
(5,033
 )    
(5,656
 )
Amounts reclassified from accumulated other comprehensive income (loss)
    
(25
 )    
-
      
(25
 )
Net current period other comprehensive loss
    
(648
 )    
(5,033
 )    
(5,681
 )
Balance as of December 31, 2016
    
(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