Note 12 - Regulatory Capital Requirements - Actual and Required Capital Amount and Ratio (Details) $ in Thousands	Dec. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Jan. 01, 2015
Common equity tier 1 capital, actual amount	$ 198,895	$ 208,836
Common equity tier 1 capital, actual ratio	0.1249	0.1244
Common equity tier 1 capital, for capital adequacy purposes, amount	$ 71,656	$ 75,515
Common equity tier 1 capital, for capital adequacy purposes, ratio	0.045	0.045	0.045
Common equity tier 1 capital, well capitalized, amount	$ 103,504	$ 109,077
Common equity tier 1 capital, well capitalized, ratio	0.065	0.065
Tier 1 risk-based capital, actual amount	$ 198,895	$ 208,836
Tier 1 risk-based capital, actual ratio	0.1249	0.1244
Tier 1 risk-based capital, for capital adequacy purposes, amount	$ 95,542	$ 100,686
Tier 1 risk-based capital, for capital adequacy purposes, ratio	0.06	0.06	0.06
Tier 1 risk-based capital, well capitalized, amount	$ 127,389	$ 134,248
Tier 1 risk-based capital, well capitalized, ratio	0.08	0.08
Total risk-based capital, actual amount	$ 215,737	$ 228,409
Total risk-based capital, actual ratio	0.1355	0.1361
Total risk-based capital, for capital adequacy purposes, amount	$ 127,389	$ 134,248
Total risk-based capital, for capital adequacy purposes, ratio	0.08	0.08	0.08
Total risk-based capital, well capitalized, amount	$ 159,236	$ 167,810
Total risk-based capital, well capitalized, ratio	0.10	0.10
Tier 1 leverage capital, actual amount	$ 198,895	$ 208,836
Tier 1 leverage capital, actual ratio	0.0951	0.0939
Tier 1 leverage capital, for capital adequacy purposes, amount	$ 83,639	$ 88,930
Tier 1 leverage capital, for capital adequacy purposes, ratio	0.04	0.04	0.04
Tier 1 leverage capital, well capitalized, amount	$ 104,549	$ 111,163
Tier 1 leverage capital, well capitalized, ratio	0.05	0.05