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Note 9 - Fair Value Measurements
9 Months Ended
Sep. 30, 2017
Notes to Financial Statements  
Fair Value Disclosures [Text Block]
9
. FAIR VALUE MEASUR
E
MENTS
  
 
The following table details the fair value meas
urement of the financial assets (in thousands):
 
   
Fair Value Measurement at September 30, 2017
 
   
Total
   
Level 1
   
Level 2
   
Level 3
 
Money market funds
  $
11,250
    $
11,250
    $
-
    $
-
 
Corporate debt securities
   
180,551
     
-
     
180,551
     
-
 
U.S. treasuries and government agency bonds
   
16,123
     
-
     
16,123
     
-
 
Auction-rate securities backed by student-loan notes
   
5,368
     
-
     
-
     
5,368
 
Mutual funds under deferred compensation plan
   
13,097
     
13,097
     
-
     
-
 
Total
  $
226,389
    $
24,347
    $
196,674
    $
5,368
 
 
   
Fair Value Measurement at December 31, 2016
 
   
Total
   
Level 1
   
Level 2
   
Level 3
 
Money market funds
  $
24,956
    $
24,956
    $
-
    $
-
 
Corporate debt securities
   
109,644
     
-
     
109,644
     
-
 
U.S. treasuries and government agency bonds
   
45,877
     
-
     
45,877
     
-
 
Auction-rate securities backed by student-loan notes
   
5,354
     
-
     
-
     
5,354
 
Mutual funds under deferred compensation plan
   
12,108
     
12,108
     
-
     
-
 
Total
  $
197,939
    $
37,064
    $
155,521
    $
5,354
 
_________________
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, 2017
  $
5,354
 
Change in unrealized gain included in other comprehensive income
   
14
 
Balance at September 30, 2017
  $
5,368
 
 
T
he Company determined the fair value of the auction-rate securities using a discounted cash flow model with the following assumptions:
 
   
September 30,
   
December 31,
 
   
2017
   
2016
 
Time-to-liquidity (months)
 
 
24
 
   
 
24
 
 
Discount rate
 
 40%
-
9.0%
   
 4.3%
-
9.3%