Note 3 - Investment Securities (Details Textual) - USD ($)	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Proceeds from Sale of Debt Securities, Available-for-Sale	$ 0	$ 0	$ 0
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss	1,600,000	962,000
Debt Securities, Held-to-Maturity, Allowance for Credit Loss	0	0
Debt Securities, Available-for-Sale, Allowance for Credit Loss	$ 0	0
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]	Interest Receivable and Other Assets
Asset Pledged as Collateral [Member]
Financial Instruments, Owned, at Fair Value	$ 23,400,000
Asset Pledged as Collateral [Member] \| Deposits [Member]
Financial Instruments, Owned, at Fair Value	$ 48,000	$ 61,000

Amount, after allowance for credit loss, of accrued interest on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of cash inflow from sale of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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