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Note 11 - Interest and Other Income, Net
 6 Months Ended
Jun. 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 June 30,
    
Six Months Ended June 30,
  
   
2017
    
2016
    
2017
    
2016
  
Interest income
   $
1,327
     $
521
     $
2,591
     $
1,010
  
Amortization of premium on available-for-sale investments
    
(498
 )    
(192
 )    
(1,005
 )    
(363
 )
Gain on deferred compensation plan investments
    
533
      
307
      
1,266
      
607
  
Foreign currency exchange loss
    
(125
 )    
(39
 )    
(234
 )    
(122
 )
Other
    
-
      
-
      
-
      
8
  
Total
   $
1,237
     $
597
     $
2,618
     $
1,140