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Note 11 - Fair Value Measurements
3 Months Ended
Mar. 31, 2019
Notes to Financial Statements  
Fair Value Disclosures [Text Block]
11
. FAIR VALUE MEASUREMENTS  
 
The following tables summarize the fair value measurement of the financial assets (in thousands):
 
 
   
Fair Value Measurement at March 31, 2019
 
   
Total
   
Level 1
   
Level 2
   
Level 3
 
Money market funds
  $
56,082
    $
56,082
    $
-
    $
-
 
Corporate debt securities
   
143,453
     
-
     
143,453
     
-
 
U.S. treasuries and government agency bonds
   
32,202
     
-
     
32,202
     
-
 
Certificates of deposit
   
1,600
     
 
     
1,600
     
 
 
Auction-rate securities backed by student-loan notes
   
3,290
     
-
     
-
     
3,290
 
Mutual funds and money market funds under deferred compensation plan
   
20,873
     
20,873
     
-
     
-
 
Total
  $
257,500
    $
76,955
    $
177,255
    $
3,290
 
 
   
Fair Value Measurement at December 31, 2018
 
   
Total
   
Level 1
   
Level 2
   
Level 3
 
Money market funds
  $
41,135
    $
41,135
    $
-
    $
-
 
Corporate debt securities
   
170,909
     
-
     
170,909
     
-
 
U.S. treasuries and government agency bonds
   
32,068
     
-
     
32,068
     
-
 
Certificates of deposit
   
1,600
     
 
     
1,600
     
 
 
Auction-rate securities backed by student-loan notes
   
3,241
     
-
     
-
     
3,241
 
Mutual funds and money market funds under deferred compensation plan
   
18,867
     
18,867
     
-
     
-
 
Total
  $
267,820
    $
60,002
    $
204,577
    $
3,241
 
 
__________ 
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. The following table provides a rollforward of the fair value of the auction-rate securities (in thousands): 
 
Balance at January 1, 2019
  $
3,241
 
Change in unrealized gain included in other comprehensive income
   
49
 
Balance at March 31, 2019
  $
3,290
 
 
The Company determined the fair value of the auction-rate securities using a discounted cash flow model with the following assumptions: 
 
   
March 31,
   
December 31,
 
   
2019
   
2018
 
Time-to-liquidity (years)
 
2
-
3
   
2
-
3
 
Discount rate
 
4.6%
-
9.9%
   
4.9%
-
10.1%