Note 8 - Regulatory Matters - Schedule of Regulatory Capital (Details) $ in Thousands	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Total capital to risk-weighted assets, actual, amount	$ 94,629	$ 92,495
Total capital to risk-weighted assets, actual, ratio	0.1311	0.1311
Total capital to risk-weighted assets, for capital adequacy purposes, amount	$ 57,736	$ 56,448
Total capital to risk-weighted assets, for capital adequacy purposes, ratio	0.0800	0.0800
Total capital to risk-weighted assets, to be well capitalized, amount	$ 72,170	$ 70,559
Total capital to risk-weighted assets, to be well capitalized, ratio	0.1000	0.1000
Tier 1 capital to risk-weighted assets, actual, amount	$ 85,592	$ 83,656
Tier 1 capital to risk-weighted assets, actual, ratio	0.1186	0.1186
Tier 1 capital to risk-weighted assets, for capital adequacy purposes, amount	$ 43,302	$ 42,336
Tier 1 capital to risk-weighted assets, for capital adequacy purposes, ratio	0.0600	0.0600
Tier 1 capital to risk-weighted assets, to be well capitalized, amount	$ 57,736	$ 56,448
Tier 1 capital to risk-weighted assets, to be well capitalized, ratio	0.0800	0.0800
Common equity tier 1 capital to risk-weighted assets, actual, amount	$ 85,592	$ 83,656
Common equity tier 1 capital to risk weighted assets, actual, ratio	0.1186	0.1186
Common equity tier 1 capital to risk-weighted assets, for capital adequacy purposes, amount	$ 32,477	$ 31,752
Common equity tier 1 capital to risk weighted assets, for capital adequacy purposes, ratio	0.0450	0.0450
Common equity tier 1 capital to risk-weighted assets, to. be well capitalized, amount	$ 46,911	$ 45,864
Common equity tier 1 capital to risk weighted assets, to be well capitalized, ratio	0.0650	0.0650
Tier 1 capital to average assets, actual, amount	$ 85,592	$ 83,656
Tier 1 capital to average asset, actual, ratio	0.0818	0.0798
Tier 1 capital to average assets, for capital adequacy purposes, amount	$ 41,834	$ 41,926
Tier 1 capital to average asset, for capital adequacy purposes, ratio	0.0400	0.0400
Tier 1 capital to average assets, to be well capitalized, amount	$ 52,292	$ 52,407
Tier 1 capital to average asset, to be well capitalized, ratio	0.0500	0.0500