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Note 13 - Accumulated Other Comprehensive Loss (Tables)
 6 Months Ended
Jun. 30, 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, 2017
   $
(1,023
 )   $
(3,192
 )   $
(4,215
 )
Other comprehensive income before reclassifications
    
202
      
1,306
      
1,508
  
Amounts reclassified from accumulated other comprehensive loss
    
-
      
-
      
-
  
Net current period other comprehensive income
    
202
      
1,306
      
1,508
  
Balance as of March 31, 2017
    
(821
 )    
(1,886
 )    
(2,707
 )
Other comprehensive income before reclassifications
    
144
      
1,186
      
1,330
  
Amounts reclassified from accumulated other comprehensive loss
    
(3
 )    
-
      
(3
 )
Net current period other comprehensive income
    
141
      
1,186
      
1,327
  
Balance as of June 30, 2017
   $
(680
 )   $
(700
 )   $
(1,380
 )