Note 4 - Loans - Schedule of Past Due Financing Receivables (Details) - USD ($)	Jun. 30, 2024	Dec. 31, 2023
Total loans	$ 710,393,067	$ 717,474,584
Financial Asset, 30 to 59 Days Past Due [Member]
Total loans	892,046	0
Financial Asset, 60 to 89 Days Past Due [Member]
Total loans	184,063	297,118
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Total loans	12,417,607	12,308,911
Financial Asset, Past Due [Member]
Total loans	13,493,716	12,606,029
Financial Asset, Not Past Due [Member]
Total loans	696,899,351	704,868,555
Residential Portfolio Segment [Member] | Real Estate Loan [Member]
Total loans	475,726,923	486,052,422
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Total loans	130,843	0
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Total loans	184,063	297,118
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Total loans	1,073,502	964,806
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Financial Asset, Past Due [Member]
Total loans	1,388,408	1,261,924
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Financial Asset, Not Past Due [Member]
Total loans	474,338,515	484,790,498
Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member]
Total loans	110,832,807	99,830,514
Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Total loans	761,203	0
Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Total loans	0	0
Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Total loans	450,392	450,392
Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member] | Financial Asset, Past Due [Member]
Total loans	1,211,595	450,392
Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member] | Financial Asset, Not Past Due [Member]
Total loans	109,621,212	99,380,122
Multi-Family Real Estate [Member] | Real Estate Loan [Member]
Total loans	75,230,316	75,612,566
Multi-Family Real Estate [Member] | Real Estate Loan [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Total loans	0	0
Multi-Family Real Estate [Member] | Real Estate Loan [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Total loans	0	0
Multi-Family Real Estate [Member] | Real Estate Loan [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Total loans	0	0
Multi-Family Real Estate [Member] | Real Estate Loan [Member] | Financial Asset, Past Due [Member]
Total loans	0	0
Multi-Family Real Estate [Member] | Real Estate Loan [Member] | Financial Asset, Not Past Due [Member]
Total loans	75,230,316	75,612,566
Construction Loans [Member] | Real Estate Loan [Member]
Total loans	38,492,041	49,302,040
Construction Loans [Member] | Real Estate Loan [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Total loans	0	0
Construction Loans [Member] | Real Estate Loan [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Total loans	0	0
Construction Loans [Member] | Real Estate Loan [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Total loans	10,893,713	10,893,713
Construction Loans [Member] | Real Estate Loan [Member] | Financial Asset, Past Due [Member]
Total loans	10,893,713	10,893,713
Construction Loans [Member] | Real Estate Loan [Member] | Financial Asset, Not Past Due [Member]
Total loans	27,598,328	38,408,327
Commercial and Industrial [Member]
Total loans	10,067,071	6,658,370
Commercial and Industrial [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Total loans	0	0
Commercial and Industrial [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Total loans	0	0
Commercial and Industrial [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Total loans	0	0
Commercial and Industrial [Member] | Financial Asset, Past Due [Member]
Total loans	0	0
Commercial and Industrial [Member] | Financial Asset, Not Past Due [Member]
Total loans	10,067,071	6,658,370
Commercial and Industrial [Member] | Real Estate Loan [Member]
Total loans	10,067,071	6,658,370
Consumer Portfolio Segment [Member]
Total loans	43,909	18,672
Consumer Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Total loans	0	0
Consumer Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Total loans	0	0
Consumer Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Total loans	0	0
Consumer Portfolio Segment [Member] | Financial Asset, Past Due [Member]
Total loans	0	0
Consumer Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Total loans	$ 43,909	$ 18,672