Note 8 - Loans Receivable, Net - Aging of Recorded Investment (Details) - USD ($)	Sep. 30, 2023	Dec. 31, 2022
Loans	$ 609,783,265	$ 560,987,903
Financial Asset, 30 to 59 Days Past Due [Member]
Loans	3,019,289	4,704,982
Financial Asset, 60 to 89 Days Past Due [Member]
Loans	298,011	170,021
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans	739,867	1,073,256
Financial Asset, Past Due [Member]
Loans	4,057,167	5,948,259
Financial Asset, Not Past Due [Member]
Loans	605,726,098	555,039,644
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Loans	101,493,816	112,793,694
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans	124,822	0
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans	0	0
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans	0	100,472
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Financial Asset, Past Due [Member]
Loans	124,822	100,472
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Financial Asset, Not Past Due [Member]
Loans	101,368,994	112,693,222
Commercial Real Estate Portfolio Segment [Member] | Residential Mortgage [Member]
Loans	159,980,843	110,056,973
Commercial Real Estate Portfolio Segment [Member] | Residential Mortgage [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans	855,243	1,557,114
Commercial Real Estate Portfolio Segment [Member] | Residential Mortgage [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans	49,507	0
Commercial Real Estate Portfolio Segment [Member] | Residential Mortgage [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans	266,093	471,430
Commercial Real Estate Portfolio Segment [Member] | Residential Mortgage [Member] | Financial Asset, Past Due [Member]
Loans	1,170,843	2,028,544
Commercial Real Estate Portfolio Segment [Member] | Residential Mortgage [Member] | Financial Asset, Not Past Due [Member]
Loans	158,810,000	108,028,429
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member]
Loans	256,175,825	252,154,475
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans	1,507,997	2,670,997
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans	145,677	89,342
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans	340,906	354,406
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member] | Financial Asset, Past Due [Member]
Loans	1,994,580	3,114,745
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member] | Financial Asset, Not Past Due [Member]
Loans	254,181,245	249,039,730
Commercial and Agricultural Loans [Member]
Loans	34,404,989	30,647,975
Commercial and Agricultural Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans	7,141	5,683
Commercial and Agricultural Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans	1,975	2,113
Commercial and Agricultural Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans	24,639	55,468
Commercial and Agricultural Loans [Member] | Financial Asset, Past Due [Member]
Loans	33,755	63,264
Commercial and Agricultural Loans [Member] | Financial Asset, Not Past Due [Member]
Loans	34,371,234	30,584,711
Consumer Portfolio Segment [Member] | Home Equity Line of Credit [Member]
Loans	33,318,762	31,736,676
Consumer Portfolio Segment [Member] | Home Equity Line of Credit [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans	181,306	199,414
Consumer Portfolio Segment [Member] | Home Equity Line of Credit [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans	51,663	0
Consumer Portfolio Segment [Member] | Home Equity Line of Credit [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans	20,687	74,159
Consumer Portfolio Segment [Member] | Home Equity Line of Credit [Member] | Financial Asset, Past Due [Member]
Loans	253,656	273,573
Consumer Portfolio Segment [Member] | Home Equity Line of Credit [Member] | Financial Asset, Not Past Due [Member]
Loans	33,065,106	31,463,103
Consumer Portfolio Segment [Member] | Other Consumer Loans [Member]
Loans	24,409,030	23,598,110
Consumer Portfolio Segment [Member] | Other Consumer Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans	342,780	271,774
Consumer Portfolio Segment [Member] | Other Consumer Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans	49,189	78,566
Consumer Portfolio Segment [Member] | Other Consumer Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans	87,542	17,321
Consumer Portfolio Segment [Member] | Other Consumer Loans [Member] | Financial Asset, Past Due [Member]
Loans	479,511	367,661
Consumer Portfolio Segment [Member] | Other Consumer Loans [Member] | Financial Asset, Not Past Due [Member]
Loans	$ 23,929,519	$ 23,230,449