Annual report [Section 13 and 15(d), not S-K Item 405]

Note 3 - Cash Equivalents and Investments (Details Textual)

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Note 3 - Cash Equivalents and Investments (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2024
Debt Securities, Available-for-Sale, Unrealized Loss Position $ 0 $ 0
Proceeds from Sale of Debt Securities, Available-for-Sale $ 0  
US Treasury Bill Securities [Member]    
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss, Current   14,400
Debt Securities, Held-to-Maturity, Unrealized Loss Position   $ 0