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Note 3 - Fair Value Measurement (Tables)
9 Months Ended
Sep. 30, 2020
Notes Tables  
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
  

September 30, 2020

 

(in thousands)

 

Total

  

Level 1

  

Level 2

  

Level 3

 

Assets:

                
U.S. Government money market funds $12,408  $12,408  $  $ 
Tri-party reverse repurchase agreements (collateralized by at least 102% U.S. Treasury and Agency Securities)  137,522      137,522    

Total

 $149,930  $12,408  $137,522  $ 
  

December 31, 2019

 

(in thousands)

 

Total

  

Level 1

  

Level 2

  

Level 3

 

Assets:

                
U.S. Government money market funds $14,971  $14,971  $  $ 
Tri-party reverse repurchase agreements (collateralized by at least 102% U.S. Treasury and Agency Securities)  154,258      154,258    

Total

 $169,229  $14,971  $154,258  $