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Note 6 - Fair Value Measurement (Tables)
3 Months Ended
Mar. 31, 2021
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

Description

 

March 31, 2021 (unaudited)

  

Level I

(unaudited)

  

Level II (unaudited)

  

Level III (unaudited)

 

Assets:

                

Marketable securities:

                

Corporate bonds

 $83,884  $  $83,884  $ 
                 

Liabilities:

                

Foreign exchange contracts

  28      28    
                 
                 

Description

 

December 31, 2020

  

Level I

  

Level II

  

Level III

 

Assets:

                

Marketable securities:

                

Corporate bonds

 $88,754     $88,754