Note 13 - Regulatory Capital and Oversight - Capital Amounts and Ratios (Details) $ in Thousands	Mar. 31, 2023 USD ($)
Common equity tier 1 capital, actual amount	$ 101,168
Common equity tier 1 capital, actual percent of asset	0.1159
Common equity tier 1 capital, amount required to be adequately capitalized	$ 39,274
Common equity tier 1 capital, percent of assets required to be adequately capitalized	0.0450
Common equity tier 1 capital, excess capital amount	$ 61,894
Common equity tier 1 capital, excess capital percent of assets	0.0709
Common equity tier 1 capital, amount to be well capitalized under prompt corrective action provisions	$ 56,730
Common equity tier 1 capital, percent of assets to be well capitalized under prompt corrective action provisions	0.0650
Tier 1 leverage, actual amount	$ 101,168
Tier 1 leverage, actual percent of asset	0.0920	[1]
Tier 1 leverage, amount required to be adequately capitalized	$ 43,977
Tier 1 leverage, percent of assets required to be adequately capitalized	0.0400	[1]
Tier 1 leverage, excess capital amount	$ 57,191
Tier 1 leverage, excess capital percent of assets	0.0520	[1]
Tier 1 leverage, amount to be well capitalized under prompt corrective action provisions	$ 54,971
Tier 1 leverage, percent of assets to be well capitalized under prompt corrective action provisions	0.0500	[1]
Tier 1 risk-based capital, actual amount	$ 101,168
Tier 1 risk-based capital, actual percent of asset	0.1159
Tier 1 risk-based capital, amount required to be adequately capitalized	$ 52,366
Tier 1 risk-based capital, percent of assets required to be adequately capitalized	0.0600
Tier 1 risk-based capital, excess capital amount	$ 48,802
Tier 1 risk-based capital, excess capital percent of assets	0.0559
Tier 1 risk-based capital, amount to be well capitalized under prompt corrective action provisions	$ 69,821
Tier 1 risk-based capital, percent of assets to be well capitalized under prompt corrective action provisions	0.0800
Total risk-based capital, actual amount	$ 112,084
Total risk-based capital, actual percent of asset	0.1284
Total risk-based capital, amount required to be adequately capitalized	$ 69,821
Total risk-based capital, percent of assets required to be adequately capitalized	0.0800
Total risk-based capital, excess capital amount	$ 42,263
Total risk-based capital, excess capital percent of assets	0.0484
Total risk-based capital, amount to be well capitalized under prompt corrective action provisions	$ 87,276
Total risk-based capital, percent of assets to be well capitalized under prompt corrective action provisions	0.1000

[1] Based upon the Bank’s adjusted total assets for the purpose of the Tier 1 leverage capital ratio and risk-weighted assets for the purpose of the risk-based capital ratios.