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Note 1 - Description of Business and Summary of Significant Accounting Policies - Held to Maturity Securities (Details) - US Treasury Securities [Member] - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Held to maturity U.S. Treasury securities, amortized cost | $ 950 | $ 950
Held to maturity U.S. Treasury securities, gross unrealized gains | 40 | 26
Held to maturity U.S. Treasury securities, fair value | $ 990 | $ 977

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