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Note 3 - Loans - Schedule of Financing Receivables (Details) - USD ($)	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2023
Total loans	$ 704,075,375	$ 714,337,185
Allowance for credit losses	(2,590,950)	(2,620,949)	$ (2,785,949)	$ (2,785,949)
Net loans	701,484,425	711,716,236
Residential Portfolio Segment [Member] | Real Estate Loan [Member]
Total loans	466,177,175	472,747,542
Allowance for credit losses	(1,660,885)	(1,680,949)	(1,859,349)	(1,851,969)
Commercial and Multi-Family Real Estate [Member] | Real Estate Loan [Member]
Total loans	125,783,750	118,008,866
Multi-Family Real Estate [Member] | Real Estate Loan [Member]
Total loans	73,465,142	74,152,418
Allowance for credit losses	(278,916)	(289,000)	(317,700)	(317,300)
Construction Loans [Member] | Real Estate Loan [Member]
Total loans	33,501,463	43,183,657
Allowance for credit losses	(92,712)	(123,000)	(124,100)	(157,500)
Commercial and Industrial [Member]
Total loans	5,070,847	6,163,747
Allowance for credit losses	(24,340)	(20,000)	(20,700)	(22,000)
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
Allowance for credit losses	(223)	0	$ 0	$ 0
Consumer Portfolio Segment [Member] | Consumer Loans [Member]
Total loans	$ 76,998	$ 80,955

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