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Note 9 - Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2018
Notes Tables  
Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]
   
March 31, 2018
 
   
Carrying
   
Fair
   
Fair Value
 
   
Amount
   
Value
   
Hierarchy
 
Assets:
 
 
 
 
 
 
 
 
 
 
 
 
Cash and cash equivalents
:
 
 
 
 
 
 
 
 
 
 
 
 
Money market investments
  $
21,508
    $
21,508
     
Level 1
 
Commercial paper
  $
144,699
    $
144,612
     
Level 2
 
Liabilities
:
 
 
 
 
 
 
 
 
 
 
 
 
Long-term debt, including current portion:
 
 
 
 
 
 
 
 
 
 
 
 
Notes
  $
450,000
    $
459,000
     
Level 2
 
Senior Credit Facilities
  $
741,563
    $
741,563
     
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