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Note 4 - Loans - Schedule of Financing Receivables (Details) - USD ($)	Sep. 30, 2025	Jun. 30, 2025	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023
Total loans	$ 671,771,935		$ 714,337,185
Allowance for credit losses	(2,540,950)	$ (2,590,950)	(2,620,949)	$ (2,747,949)	$ (2,747,949)	$ (2,785,949)
Net loans	669,230,985		711,716,236
Residential Portfolio Segment [Member] | Real Estate Loan [Member]
Total loans	449,596,294		472,747,542
Allowance for credit losses	(1,619,601)	(1,660,885)	(1,680,949)	(1,826,538)	(1,836,909)	(1,851,969)
Commercial and Multi-Family Real Estate [Member] | Real Estate Loan [Member]
Total loans	122,811,801		118,008,866
Multi-Family Real Estate [Member] | Real Estate Loan [Member]
Total loans	70,364,169		74,152,418
Allowance for credit losses	(288,041)	(278,916)	(289,000)	(313,221)	(315,495)	(317,300)
Construction Loans [Member] | Real Estate Loan [Member]
Total loans	25,231,859		43,183,657
Allowance for credit losses	(58,786)	(92,712)	(123,000)	(112,118)	(105,426)	(157,500)
Commercial and Industrial [Member]
Total loans	3,703,476		6,163,747
Allowance for credit losses	(17,777)	(24,340)	(20,000)	(33,757)	(33,221)	(22,000)
Commercial and Industrial [Member] | Real Estate Loan [Member]
Total loans	3,703,476		6,163,747
Consumer Portfolio Segment [Member]
Total loans	64,336		80,955
Allowance for credit losses	(187)	$ (223)	0	$ 0	$ 0	$ 0
Consumer Portfolio Segment [Member] | Consumer Loans [Member]
Total loans	$ 64,336		$ 80,955

X

- Definition

Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-1

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X

- Definition

Amortized cost excluding accrued interest, after allowance for credit loss, of financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-1

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-5

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