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Note 3 - Cash, Cash Equivalents, and Marketable Securities (Details Textual) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Proceeds from Sale and Maturity of Marketable Securities $ 6,300 $ 5,000  
Debt Securities, Available-for-Sale, Allowance for Credit Loss $ 0   $ 0