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Note 14 - Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

December 31, 2019

 

Total

   

Level 1

   

Level 2

 

Assets

                       

Cash equivalents:

                       

Money market funds

  $ 190,598     $ 67,494     $ 123,104  

Commercial paper

    9,465             9,465  

Municipal bonds

    1,250             1,250  

Investments in marketable securities:

                       
U.S. Treasury securities     3,759       3,759        
Municipal bonds     6,119             6,119  

Corporate notes/bonds

    119,449             119,449  

Asset-backed securities

    4,268             4,268  

Commercial paper

    6,464             6,464  

Certificate of deposit

    72       72        
    $ 341,444     $ 71,325     $ 270,119  

December 31, 2018

 

Total

   

Level 1

   

Level 2

 

Assets

                       

Cash equivalents:

                       

Money market funds

  $ 740     $ 38     $ 702  

Commercial paper

    96,759             96,759  

Investments in marketable securities:

                       

Municipal bonds

    6,733             6,733  

Corporate notes/bonds

    146,126             146,126  

Variable rate demand notes

    8,900             8,900  

Asset-backed securities

    32,923             32,923  

Commercial paper

    39,701             39,701  

Certificate of deposit

    956       956        
    $ 332,838     $ 994     $ 331,844