Note 10 - Income Taxes - Reconciliation of Tax Provision (Benefit) (Details) - USD ($) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2025	Dec. 31, 2024
Federal income tax computed at statutory rates			$ (1,141)	$ (1,587)
Federal income tax computed at statutory rates, percent	21.00%	21.00%	21.00%	21.00%
State taxes (1)			$ 18	$ (37)
State taxes (1), percent			(0.33%)	0.49%
Tax-exempt income, net of amount disallowed			$ (9)	$ 39
Tax-exempt income, net of amount disallowed, percent			0.17%	(0.52%)
Bank-owned life insurance income			$ (609)	$ (568)
Bank-owned life insurance income, percent			11.20%	7.52%
Bank-owned life insurance early surrender of contract			$ 0	$ 1,172
Bank-owned life insurance early surrender of contract, percent			0.00%	(15.51%)
Bank-owned life insurance penalty for early surrender of contract			$ 266	$ 261
Bank-owned life insurance penalty for early surrender of contract, percent			(4.90%)	(3.46%)
Other nondeductible			$ (28)	$ (44)
Other nondeductible, percent			0.52%	0.58%
Low-income housing tax credits, net (2)			$ (69)	$ (43)
Low-income housing tax credits, net (2), percent			1.26%	0.57%
Other, net			$ 329	$ (137)
Other, net, percent			(6.05%)	1.82%
Total benefit for income tax			$ (1,243)	$ (944)
Total benefit for income tax, percent			22.87%	12.49%