Note 13 - Capital Requirements - Capital Amounts and Ratios (Details)	Sep. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)
Capital	$ 89,701	$ 84,176
Capital, ratio	0.1254	0.1310
Capital required for capital adequacy	$ 57,228	$ 51,409
Capital required for capital adequacy, ratio	0.0800	0.0800
Capital required to be well capitalized	$ 71,535	$ 64,261
Capital required to be well capitalized, ratio	0.1000	0.1000
Tier 1 capital risk	$ 84,115	$ 79,240
Tier 1 capital risk, raio	0.1176	0.1233
Tier 1 Capital risk required for capital adequacy	$ 42,921	$ 38,557
Tier 1 Capital risk required for capital adequacy, ratio	0.0600	0.0600
Tier 1 Capital risk required to be well capitalized	$ 57,228	$ 51,409
Tier 1 Capital risk required to be well capitalized, ratio	0.0800	0.0800
Common equity Tier 1	$ 84,115	$ 79,240
Common equity Tier 1, raio	0.1176	0.1233
Common equity Tier 1 required for capital adequacy	$ 32,191	$ 28,918
Common equity Tier 1 required for capital adequacy, raio	0.0450	0.0450
Common equity Tier 1 required to be well capitalized	$ 46,498	$ 41,770
Common equity Tier 1 required to be well capitalized, ratio	0.0650	0.0650
Tier 1 capital average	$ 84,115	$ 79,240
Tier 1 capital average, ratio	0.0873	0.0950
Tier 1 capital average required for capital adequacy	$ 38,561	$ 33,354
Tier 1 capital average required for capital adequacy, ratio	0.0400	0.0400
Tier 1 capital average required to be well capitalized	$ 48,201	$ 41,692
Tier 1 capital average required to be well capitalized, ratio	0.0500	0.0500