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Note 11 - Interest and Other Income, Net
 9 Months Ended
Sep. 30, 2017
Notes to Financial Statements  
Other Nonoperating Income and Expense [Text Block]
11.
INTEREST AND OTHER INCOME, NET
 
The components of interest and other income, net are as follows (in thousands):
 
   
Three Months Ended September 30,
    
Nine Months Ended September 30,
  
   
2017
    
2016
    
2017
    
2016
  
Interest income
   $
1,346
     $
585
     $
3,938
     $
1,595
  
Amortization of premium on available-for-sale investments
    
(490
 )    
(252
 )    
(1,494
 )    
(619
 )
Gain on deferred compensation plan investments
    
636
      
488
      
1,902
      
1,097
  
Foreign currency exchange loss
    
(237
 )    
(48
 )    
(473
 )    
(170
 )
Other
    
-
      
7
      
-
      
17
  
Total
   $
1,255
     $
780
     $
3,873
     $
1,920