Note 4 - Loans - Past Due Loans (Details) - USD ($)	Mar. 31, 2022	Dec. 31, 2021
Loans	$ 488,169,810	$ 486,381,167
Loans, 90 days past due and still accruing	0	480,902
Financial Asset, 30 to 59 Days Past Due [Member]
Loans	0	0
Financial Asset, 60 to 89 Days Past Due [Member]
Loans	216,082	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans	686,910	1,167,812
Financial Asset, Past Due [Member]
Loans	902,992	1,167,812
Financial Asset, Not Past Due [Member]
Loans	487,266,818	485,213,355
Commercial Real Estate Portfolio Segment [Member]
Loans	329,179,712	319,185,116
Loans, 90 days past due and still accruing	0	0
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans	0	0
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans	0	0
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans	502,961	502,961
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Past Due [Member]
Loans	502,961	502,961
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Loans	328,676,751	318,682,155
Construction and Land Development [Member]
Loans	20,325,400	28,221,854
Loans, 90 days past due and still accruing	0	0
Construction and Land Development [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans	0	0
Construction and Land Development [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans	0	0
Construction and Land Development [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans	0	0
Construction and Land Development [Member] | Financial Asset, Past Due [Member]
Loans	0	0
Construction and Land Development [Member] | Financial Asset, Not Past Due [Member]
Loans	20,325,400	28,221,854
Residential Portfolio Segment [Member]
Loans	111,993,662	107,436,033
Loans, 90 days past due and still accruing	0	217,661
Residential Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans	0	0
Residential Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans	216,082	0
Residential Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans	31,500	249,161
Residential Portfolio Segment [Member] | Financial Asset, Past Due [Member]
Loans	247,582	249,161
Residential Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Loans	111,746,080	107,186,872
Commercial Portfolio Segment [Member]
Loans	26,374,885	31,182,206
Loans, 90 days past due and still accruing	0	263,241
Commercial Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans	0	0
Commercial Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans	0	0
Commercial Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans	152,449	415,690
Commercial Portfolio Segment [Member] | Financial Asset, Past Due [Member]
Loans	152,449	415,690
Commercial Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Loans	26,222,436	30,766,516
Consumer Portfolio Segment [Member]
Loans	296,151	355,958
Loans, 90 days past due and still accruing	0	0
Consumer Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans	0	0
Consumer Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans	0	0
Consumer Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans	0	0
Consumer Portfolio Segment [Member] | Financial Asset, Past Due [Member]
Loans	0	0
Consumer Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Loans	$ 296,151	$ 355,958