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Note 3 - Investment Securities - Summary of Investments (Details) - USD ($) $ in Thousands | Mar. 31, 2026 | Dec. 31, 2025
--- | --- | ---
Total available for sale, available for sale, amortized cost | $ 4,639 | $ 5,015
Available for sale securities, gross unrealized gains | 13 | 10
Available for sale securities, gross unrealized losses | 286 | 279
Investment securities available for sale, at fair value | 4,366 | 4,746
Investment securities held to maturity, net of allowance for credit losses | 8,760 | 8,777
Held to maturity, gross unrealized gains | 0 | 0
Held to maturity, gross unrealized losses | 1,398 | 1,290
Investment Securities, Held to Maturity, Fair Value | 7,362 | 7,487
Residential Mortgage-Backed Securities [Member] |  |
Total available for sale, available for sale, amortized cost | 4,139 | 4,515
Available for sale securities, gross unrealized gains | 8 | 10
Available for sale securities, gross unrealized losses | 286 | 279
Investment securities available for sale, at fair value | 3,861 | 4,246
Investment securities held to maturity, net of allowance for credit losses | 4,719 | 4,753
Held to maturity, gross unrealized gains | 0 | 0
Held to maturity, gross unrealized losses | 974 | 945
Investment Securities, Held to Maturity, Fair Value | 3,745 | 3,808
Corporate Debt Securities [Member] |  |
Total available for sale, available for sale, amortized cost | 500 | 500
Available for sale securities, gross unrealized gains | 5 | 0
Available for sale securities, gross unrealized losses | 0 | 0
Investment securities available for sale, at fair value | 505 | 500
US States and Political Subdivisions Debt Securities [Member] |  |
Investment securities held to maturity, net of allowance for credit losses | 4,041 | 4,024
Held to maturity, gross unrealized gains | 0 | 0
Held to maturity, gross unrealized losses | 424 | 345
Investment Securities, Held to Maturity, Fair Value | $ 3,617 | $ 3,679

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