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Note 5 - Fair Value Measurement (Tables)
12 Months Ended
Dec. 31, 2021
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

Description

 

December 31, 2021

  

Level I

  

Level II

  

Level III

 

Assets:

                

Marketable securities:

                

Corporate bonds

 $90,298     $90,298    

Foreign exchange contract

  63      63    

Investments in marketable equity securities

  2,919   2,919       

Description

 

December 31, 2020

  

Level I

  

Level II

  

Level III

 

Assets:

                

Marketable securities:

                

Corporate bonds

 $88,754     $88,754