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Note 11 - Interest and Other Income, Net (Tables)
 3 Months Ended
Mar. 31, 2017
Notes Tables  
Schedule of Other Nonoperating Income (Expense) [Table Text Block]
 
 
Three Months Ended March 31,
 
 
 
2017
 
 
2016
 
Interest income
   $
1,264
    $
489
 
Amortization of premium on available-for-sale investments
    
(507
 )    
(171
 )
Gain on employee deferred compensation plan investments
    
733
     
302
 
Foreign currency exchange loss
    
(109
 )    
(83
 )
Other
    
-
     
6
 
Total
   $
1,381
    $
543