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Note 7 - Fair Value Measurement (Tables)
9 Months Ended
Sep. 30, 2021
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

Description

 

September 30,

2021 (unaudited)

  

Level I

(unaudited)

  

Level II

(unaudited)

  

Level III

(unaudited)

 

Assets:

                

Marketable securities:

                

Corporate bonds

 $74,149  $  $74,149  $ 

Description

 

December 31, 2020

  

Level I

  

Level II

  

Level III

 

Assets:

                

Marketable securities:

                

Corporate bonds

 $88,754     $88,754