Note 3 - Loans - Schedule of Financing Receivables by Collateral (Details) - USD ($)	Mar. 31, 2025	Dec. 31, 2024
Total loans	$ 704,075,375	$ 714,337,185
Real Estate [Member]
Total loans	13,893,975	13,962,695
Other Collateral [Member]
Total loans	0	0
Commercial and Industrial [Member]
Total loans	5,070,847	6,163,747
Commercial and Industrial [Member] \| Real Estate [Member]
Total loans		0
Commercial and Industrial [Member] \| Other Collateral [Member]
Total loans	0	0
Consumer Portfolio Segment [Member]
Total loans	76,998	80,955
Real Estate Loan [Member] \| Residential Portfolio Segment [Member]
Total loans	466,177,175	472,747,542
Real Estate Loan [Member] \| Residential Portfolio Segment [Member] \| Real Estate [Member]
Total loans	2,250,578	1,863,957
Real Estate Loan [Member] \| Residential Portfolio Segment [Member] \| Other Collateral [Member]
Total loans	0	0
Real Estate Loan [Member] \| Commercial Real Estate Portfolio Segment [Member]
Total loans	125,783,750	118,008,866
Real Estate Loan [Member] \| Commercial Real Estate Portfolio Segment [Member] \| Real Estate [Member]
Total loans	749,684	1,205,025
Real Estate Loan [Member] \| Commercial Real Estate Portfolio Segment [Member] \| Other Collateral [Member]
Total loans	0	0
Real Estate Loan [Member] \| Multi-Family Real Estate [Member]
Total loans	73,465,142	74,152,418
Real Estate Loan [Member] \| Multi-Family Real Estate [Member] \| Real Estate [Member]
Total loans		0
Real Estate Loan [Member] \| Multi-Family Real Estate [Member] \| Other Collateral [Member]
Total loans	0	0
Real Estate Loan [Member] \| Construction Loans [Member]
Total loans	33,501,463	43,183,657
Real Estate Loan [Member] \| Construction Loans [Member] \| Real Estate [Member]
Total loans	10,893,713	10,893,713
Real Estate Loan [Member] \| Construction Loans [Member] \| Other Collateral [Member]
Total loans	0	0
Real Estate Loan [Member] \| Commercial and Industrial [Member]
Total loans	5,070,847	6,163,747
Consumer Loans [Member] \| Consumer Portfolio Segment [Member]
Total loans	76,998	80,955
Consumer Loans [Member] \| Consumer Portfolio Segment [Member] \| Real Estate [Member]
Total loans		0
Consumer Loans [Member] \| Consumer Portfolio Segment [Member] \| Other Collateral [Member]
Total loans	$ 0	$ 0