Note 3 - Loans - Schedule of Past Due Financing Receivables (Details) - USD ($)	Mar. 31, 2025	Dec. 31, 2024
Total loans	$ 704,075,375	$ 714,337,185
Financial Asset, 30 to 59 Days Past Due [Member]
Total loans	1,174,160	119,309
Financial Asset, 60 to 89 Days Past Due [Member]
Total loans	54,659	1,607,835
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Total loans	12,268,257	12,612,035
Financial Asset, Past Due [Member]
Total loans	13,497,076	14,339,179
Financial Asset, Not Past Due [Member]
Total loans	690,578,299	699,998,006
Residential Portfolio Segment [Member] \| Real Estate Loan [Member]
Total loans	466,177,175	472,747,542
Residential Portfolio Segment [Member] \| Real Estate Loan [Member] \| Financial Asset, 30 to 59 Days Past Due [Member]
Total loans	1,174,160	119,309
Residential Portfolio Segment [Member] \| Real Estate Loan [Member] \| Financial Asset, 60 to 89 Days Past Due [Member]
Total loans	54,659	1,607,835
Residential Portfolio Segment [Member] \| Real Estate Loan [Member] \| Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Total loans	624,860	513,297
Residential Portfolio Segment [Member] \| Real Estate Loan [Member] \| Financial Asset, Past Due [Member]
Total loans	1,853,679	2,240,441
Residential Portfolio Segment [Member] \| Real Estate Loan [Member] \| Financial Asset, Not Past Due [Member]
Total loans	464,323,496	470,507,101
Commercial Real Estate Portfolio Segment [Member] \| Real Estate Loan [Member]
Total loans	125,783,750	118,008,866
Commercial Real Estate Portfolio Segment [Member] \| Real Estate Loan [Member] \| Financial Asset, 30 to 59 Days Past Due [Member]
Total loans	0	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	749,684	1,205,025
Commercial Real Estate Portfolio Segment [Member] \| Real Estate Loan [Member] \| Financial Asset, Past Due [Member]
Total loans	749,684	1,205,025
Commercial Real Estate Portfolio Segment [Member] \| Real Estate Loan [Member] \| Financial Asset, Not Past Due [Member]
Total loans	125,034,066	116,803,841
Multi-Family Real Estate [Member] \| Real Estate Loan [Member]
Total loans	73,465,142	74,152,418
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	73,465,142	74,152,418
Construction Loans [Member] \| Real Estate Loan [Member]
Total loans	33,501,463	43,183,657
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	22,607,750	32,289,944
Commercial and Industrial [Member]
Total loans	5,070,847	6,163,747
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	5,070,847	6,163,747
Commercial and Industrial [Member] \| Real Estate Loan [Member]
Total loans	5,070,847	6,163,747
Consumer Portfolio Segment [Member]
Total loans	76,998	80,955
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	$ 76,998	$ 80,955