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

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) 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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