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Note 6 - Fair Value Measurement (Tables)
6 Months Ended
Jun. 30, 2020
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
  June 30, 2020  Level I  Level II  Level III 

Description

 

(unaudited)

  

(unaudited)

  

(unaudited)

  

(unaudited)

 

Assets:

                

Marketable securities:

                

Corporate bonds

 $67,293  $  $67,293  $ 

Foreign exchange contracts

  251      251    

Description

 

December 31, 2019

  

Level I

  

Level II

  

Level III

 

Assets:

                

Marketable securities:

                

Corporate bonds

  64,867      64,867    

Foreign exchange contracts

  56      56