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Note 6 - Marketable Securities (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Marketable Securities, Gain (Loss) $ 0 $ (590) $ 575 $ (7,956)  
Marketable Securities         $ 37,126
Debt Securities, Available-for-Sale         3,675
Equity Securities, FV-NI, Unrealized Gain (Loss)   $ (602) $ 3,117 (7,940)  
Debt Securities, Available-for-Sale, Unrealized Loss Position         $ 2,627
Proceeds from Sale and Maturity of Debt Securities, Available-for-Sale       $ 0