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Note 12 - Interest and Other Income, Net (Tables)
 9 Months Ended
Sep. 30, 2018
Notes Tables  
Schedule of Other Nonoperating Income (Expense) [Table Text Block]
   
Three Months Ended September 30,
    
Nine Months Ended September 30,
  
   
2018
    
2017
    
2018
    
2017
  
Interest income
   $
1,583
     $
1,346
     $
4,606
     $
3,938
  
Amortization of premium on available-for-sale securities
    
(314
 )    
(490
 )    
(1,122
 )    
(1,494
 )
Gain on deferred compensation plan investments
    
717
      
636
      
949
      
1,902
  
Foreign currency exchange gain (loss)
    
700
      
(237
 )    
915
      
(473
 )
Other
    
28
      
-
      
39
      
-
  
Total
   $
2,714
     $
1,255
     $
5,387
     $
3,873