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Note 7 - Marketable Securities (Tables)
9 Months Ended
Sep. 30, 2022
Notes Tables  
Debt Securities, Available-for-Sale [Table Text Block]
  

September 30, 2022

 
  

Adjusted Cost

  

Unrealized Gains

  

Unrealized Losses

  

Fair Value

 

Level 2:

                

Corporate debt securities

 $998  $  $  $998 

U.S. government debt securities

  2,591      (2)  2,589 

Total

 $3,589  $  $(2) $3,587 
  

December 31, 2021

 
  

Adjusted Cost

  

Unrealized Gains

  

Unrealized Losses

  

Fair Value

 

Level 2:

                

Corporate debt securities

 $5,043  $  $(2) $5,041 

Total

 $5,043  $  $(2) $5,041