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Note 10 - Interest and Other Income, Net
 12 Months Ended
Dec. 31, 2018
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,
  
   
2018
    
2017
    
2016
  
Interest income
   $
6,321
     $
5,353
     $
2,488
  
Amortization of premium on available-for-sale securities
    
(1,353
 )    
(1,976
 )    
(1,019
 )
Gain (loss) on deferred compensation plan investments
    
(1,022
 )    
2,531
      
1,257
  
Foreign currency exchange gain (loss)
    
953
      
(550
 )    
65
  
Other
    
95
      
162
      
26
  
Total
   $
4,994
     $
5,520
     $
2,817