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Note 7 - Marketable Securities - Fair Value of Available for Sale Marketable Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Adjusted Cost $ 3,589 $ 5,043
Unrealized Gains 0 0
Unrealized Losses (2) (2)
Fair Value 3,587 5,041
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Adjusted Cost 998 5,043
Unrealized Gains 0 0
Unrealized Losses 0 (2)
Fair Value 998 $ 5,041
US Government Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Adjusted Cost 2,591  
Unrealized Gains 0  
Unrealized Losses (2)  
Fair Value $ 2,589