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Note 6 - Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2017
Notes Tables  
Fair Value Inputs, Assets, Quantitative Information [Table Text Block]
   
March 31
, 201
7
 
   
Carrying
   
Fair
 
   
Amount
   
Value
 
Assets:
 
 
 
 
 
 
 
 
Money market investments
  $
72,334
    $
72,334
 
Commercial paper
  $
91,297
    $
91,512
 
Long-term debt, including current portion
:
 
 
 
 
 
 
 
 
Notes
  $
450,000
    $
469,125
 
Term Loan
  $
93,750
    $
93,750