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Note 3 - Investments - Schedule of Debt Securities, Held-to-Maturity, Allowance for Credit Loss Roll Forward (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Beginning ACL balance $ 45 $ 31 $ 0
Provision for (recapture of) credit losses 0 14 (41)
Total ending ACL balance 45 45 31
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]      
Beginning allowance balance $ 0 $ 0 $ 72