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Note 3 - Fair Value of Financial Instruments (Tables)
6 Months Ended
Jun. 30, 2020
Notes Tables  
Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]

June 30, 2020

 

Level 1

   

Level 2

   

Level 3

   

Total

 

Cash equivalents:

                               

Money market funds

  $ 14,097     $ -     $ -     $ 14,097  

Marketable investments:

                               

Available-for-sale-securities

 

3,198

      9,696    

 

-       12,894  

Total assets at fair value

  $ 17,295     $ 9,696     $ -     $ 26,991  

December 31, 2019

 

Level 1

   

Level 2

   

Level 3

   

Total

 

Cash equivalents:

                               

Money market funds

  $ 6,311     $ -     $ -     $ 6,311  

Short term marketable investments:

                               

Available-for-sale securities

    4,114       3,491    

 

-       7,605  

Total assets at fair value

  $ 10,425     $ 3,491     $ -     $ 13,916