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Note 12 - Interest and Other Income, Net (Tables)
 6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Other Nonoperating Income (Expense) [Table Text Block]
   
Three Months Ended June 30,
    
Six Months Ended June 30,
  
   
2018
    
2017
    
2018
    
2017
  
Interest income
   $
1,563
     $
1,327
     $
3,024
     $
2,591
  
Amortization of premium on available-for-sale investments
    
(374
 )    
(498
 )    
(808
 )    
(1,005
 )
Gain on deferred compensation plan investments
    
419
      
533
      
233
      
1,266
  
Foreign currency exchange gain (loss)
    
614
      
(125
 )    
214
      
(234
 )
Other
    
10
      
-
      
10
      
-
  
Total
   $
2,232
     $
1,237
     $
2,673
     $
2,618