Note 13 - Regulatory Capital and Oversight - Capital Amounts and Ratios (Details) $ in Thousands	Mar. 31, 2022 USD ($)
Common equity tier 1 capital, actual amount	$ 99,354
Common equity tier 1 capital, actual percent of asset	0.1276
Common equity tier 1 capital, amount required to be adequately capitalized	$ 35,040
Common equity tier 1 capital, percent of assets required to be adequately capitalized	0.0450
Common equity tier 1 capital, excess capital amount	$ 64,314
Common equity tier 1 capital, excess capital percent of assets	0.0826
Common equity tier 1 capital, amount to be well capitalized under prompt corrective action provisions	$ 50,614
Common equity tier 1 capital, percent of assets to be well capitalized under prompt corrective action provisions	0.0650
Tier 1 leverage, actual amount	$ 99,354
Tier 1 leverage, actual percent of asset	0.0955	[1]
Tier 1 leverage, amount required to be adequately capitalized	$ 41,633
Tier 1 leverage, percent of assets required to be adequately capitalized	0.0400	[1]
Tier 1 leverage, excess capital amount	$ 57,721
Tier 1 leverage, excess capital percent of assets	0.0555	[1]
Tier 1 leverage, amount to be well capitalized under prompt corrective action provisions	$ 52,042
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	$ 99,354
Tier 1 risk-based capital, actual percent of asset	0.1276
Tier 1 risk-based capital, amount required to be adequately capitalized	$ 46,720
Tier 1 risk-based capital, percent of assets required to be adequately capitalized	0.0600
Tier 1 risk-based capital, excess capital amount	$ 52,634
Tier 1 risk-based capital, excess capital percent of assets	0.0676
Tier 1 risk-based capital, amount to be well capitalized under prompt corrective action provisions	$ 62,294
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	$ 108,938
Total risk-based capital, actual percent of asset	0.1399
Total risk-based capital, amount required to be adequately capitalized	$ 62,294
Total risk-based capital, percent of assets required to be adequately capitalized	0.0800
Total risk-based capital, excess capital amount	$ 46,644
Total risk-based capital, excess capital percent of assets	0.0599
Total risk-based capital, amount to be well capitalized under prompt corrective action provisions	$ 77,867
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.