Note 13 - Regulatory Capital and Oversight - Capital Amounts and Ratios (Details) $ in Thousands	Sep. 30, 2020 USD ($)
Common equity tier 1 capital, actual amount	$ 86,209
Common equity tier 1 capital, actual percent of asset	0.1316
Common equity tier 1 capital, amount required to be adequately capitalized	$ 29,481
Common equity tier 1 capital, percent of assets required to be adequately capitalized	0.045
Common equity tier 1 capital, excess capital amount	$ 56,728
Common equity tier 1 capital, excess capital percent of assets	0.0866
Common equity tier 1 capital, amount to be well capitalized under prompt corrective action provisions	$ 42,583
Common equity tier 1 capital, percent of assets to be well capitalized under prompt corrective action provisions	0.065
Tier 1 capital leverage, actual amount	$ 86,209
Tier 1 capital leverage, actual percent of asset	0.0973
Tier 1 capital leverage, amount required to be adequately capitalized	$ 35,432
Tier 1 capital leverage, percent of assets required to be adequately capitalized	0.04
Tier 1 capital leverage, excess capital amount	$ 50,777
Tier 1 capital leverage, excess capital percent of assets	0.0573
Tier 1 capital leverage, amount to be well capitalized under prompt corrective action provisions	$ 44,291
Tier 1 capital leverage, percent of assets to be well capitalized under prompt corrective action provisions	0.05
Tier 1 risk-based capital, actual amount	$ 86,209
Tier 1 risk-based capital, actual percent of asset	0.1316
Tier 1 risk-based capital, amount required to be adequately capitalized	$ 39,307
Tier 1 risk-based capital, percent of assets required to be adequately capitalized	0.06
Tier 1 risk-based capital, excess capital amount	$ 46,902
Tier 1 risk-based capital, excess capital percent of assets	0.0716
Tier 1 risk-based capital, amount to be well capitalized under prompt corrective action provisions	$ 52,410
Tier 1 risk-based capital, percent of assets to be well capitalized under prompt corrective action provisions	0.08
Total risk-based capital, actual amount	$ 94,414
Total risk-based capital, actual percent of asset	0.1441
Total risk-based capital, amount required to be adequately capitalized	$ 52,410
Total risk-based capital, percent of assets required to be adequately capitalized	0.08
Total risk-based capital, excess capital amount	$ 42,004
Total risk-based capital, excess capital percent of assets	0.0641
Total risk-based capital, amount to be well capitalized under prompt corrective action provisions	$ 65,512
Total risk-based capital, percent of assets to be well capitalized under prompt corrective action provisions	0.1