Note 13 - Regulatory Capital and Oversight - Capital Amounts and Ratios (Details) $ in Thousands	Sep. 30, 2021 USD ($)
Common equity tier 1 capital, actual amount	$ 95,568
Common equity tier 1 capital, actual percent of asset	0.1385
Common equity tier 1 capital, amount required to be adequately capitalized	$ 31,060
Common equity tier 1 capital, percent of assets required to be adequately capitalized	0.0450
Common equity tier 1 capital, excess capital amount	$ 64,508
Common equity tier 1 capital, excess capital percent of assets	0.0935
Common equity tier 1 capital, amount to be well capitalized under prompt corrective action provisions	$ 44,865
Common equity tier 1 capital, percent of assets to be well capitalized under prompt corrective action provisions	0.0650
Tier 1 capital leverage, actual amount	$ 95,568
Tier 1 capital leverage, actual percent of asset	0.0964
Tier 1 capital leverage, amount required to be adequately capitalized	$ 39,674
Tier 1 capital leverage, percent of assets required to be adequately capitalized	0.0400
Tier 1 capital leverage, excess capital amount	$ 55,894
Tier 1 capital leverage, excess capital percent of assets	0.0564
Tier 1 capital leverage, amount to be well capitalized under prompt corrective action provisions	$ 49,592
Tier 1 capital leverage, percent of assets to be well capitalized under prompt corrective action provisions	0.0500
Tier 1 risk-based capital, actual amount	$ 95,568
Tier 1 risk-based capital, actual percent of asset	0.1385
Tier 1 risk-based capital, amount required to be adequately capitalized	$ 41,414
Tier 1 risk-based capital, percent of assets required to be adequately capitalized	0.0600
Tier 1 risk-based capital, excess capital amount	$ 54,154
Tier 1 risk-based capital, excess capital percent of assets	0.0785
Tier 1 risk-based capital, amount to be well capitalized under prompt corrective action provisions	$ 55,219
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	$ 104,201
Total risk-based capital, actual percent of asset	0.1510
Total risk-based capital, amount required to be adequately capitalized	$ 55,219
Total risk-based capital, percent of assets required to be adequately capitalized	0.0800
Total risk-based capital, excess capital amount	$ 48,982
Total risk-based capital, excess capital percent of assets	0.0710
Total risk-based capital, amount to be well capitalized under prompt corrective action provisions	$ 69,023
Total risk-based capital, percent of assets to be well capitalized under prompt corrective action provisions	0.1000