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Note 10 - Interest and Other Income, Net
12 Months Ended
Dec. 31, 2016
Notes to Financial Statements  
Other Nonoperating Income and Expense [Text Block]
10.
INTEREST AND OTHER INCOME, NET
 
The components of interest and other income, net are as follows (in thousands):
 
 
 
Year Ended December 31,
 
 
 
2016
 
 
2015
 
 
2014
 
Interest income
  $
2,488
    $
1,608
    $
1,112
 
Amortization of premium on available-for-sale investments
   
(1,019
)    
(463
)    
(237
)
Gain (loss) on employee deferred compensation plan investments
   
1,257
     
(375
)    
141
 
Foreign currency exchange gain
   
65
     
608
     
80
 
Other
   
26
     
43
     
(4
)
Total
  $
2,817
    $
1,421
    $
1,092