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Note 10 - Fair Value Measurements
6 Months Ended
Jun. 30, 2018
Notes to Financial Statements  
Fair Value Disclosures [Text Block]
10
. FAIR VALUE MEASUR
E
MENTS
  
 
The following table details the fair value measurement of the financial assets (in thousands):
 
   
Fair Value Measurement at June 30, 2018
 
   
Total
   
Level 1
   
Level 2
   
Level 3
 
Money market funds
  $
16,081
    $
16,081
    $
-
    $
-
 
Corporate debt securities
   
207,461
     
-
     
207,461
     
-
 
U.S. treasuries and government agency bonds
   
22,967
     
-
     
22,967
     
-
 
Auction-rate securities backed by student-loan notes
   
5,247
     
-
     
-
     
5,247
 
Mutual funds and money market funds under deferred compensation plan
   
17,113
     
17,113
     
-
     
-
 
Total
  $
268,869
    $
33,194
    $
230,428
    $
5,247
 
 
   
Fair Value Measurement at December 31, 2017
 
   
Total
   
Level 1
   
Level 2
   
Level 3
 
Money market funds
  $
7,134
    $
7,134
    $
-
    $
-
 
Corporate debt securities
   
203,807
     
-
     
203,807
     
-
 
U.S. treasuries and government agency bonds
   
13,024
     
-
     
13,024
     
-
 
Auction-rate securities backed by student-loan notes
   
5,256
     
-
     
-
     
5,256
 
Mutual funds and money market funds under deferred compensation plan
   
16,625
     
16,625
     
-
     
-
 
Total
  $
245,846
    $
23,759
    $
216,831
    $
5,256
 
 
______________
Level 
1—includes
 instruments with quoted prices in active markets for identical assets.
Level 
2—includes
 instruments for which the valuations are based upon quoted market prices in active markets involving similar assets or inputs other than quoted prices that are observable for the assets. The market inputs used to value these instruments generally consist of market yields, recently executed transactions, broker/dealer quotes or alternative pricing sources with reasonable levels of price transparency. Pricing sources 
may 
include industry standard data providers, security master files from large financial institutions, and other 
third
-party sources used to determine a daily market value.
Level 
3—includes
 instruments for which the valuations are based on inputs that are unobservable and significant to the overall fair value measurement.
 
The Company’s level 
3
 assets consist of government-backed student loan auction-rate securities, which became illiquid in 
2008.
 The following table provides a rollforward of the fair value of the auction-rate securities (in thousands): 
 
Balance at January 1, 2018
  $
5,256
 
Change in unrealized loss included in other comprehensive income
   
(9
)
Balance at June 30, 2018
  $
5,247
 
 
The Company determined the fair value of the auction-rate securities using a discounted cash flow model with the following assumptions:
 
   
June 30,
   
December 31,
 
   
2018
   
2017
 
Time-to-liquidity (years)
   
2
-
3
     
2
-
3
 
Discount rate
   
5.3%
-
10.3%
     
4.5%
-
9.6%