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Note 10 - Interest and Other Income, Net (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Other Nonoperating Income (Expense) [Table Text Block]
   
Year Ended December 31,
  
   
2017
    
2016
    
2015
  
Interest income
   $
5,353
     $
2,488
     $
1,608
  
Amortization of premium on available-for-sale investments
    
(1,976
 )    
(1,019
 )    
(463
 )
Gain (loss) on deferred compensation plan investments
    
2,531
      
1,257
      
(375
 )
Foreign currency exchange gain (loss)
    
(550
 )    
65
      
608
  
Other
    
162
      
26
      
43
  
Total
   $
5,520
     $
2,817
     $
1,421