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Note 4 - Loans - Schedule of Past Due Financing Receivables (Details) - USD ($)	Sep. 30, 2025	Dec. 31, 2024
Total loans	$ 671,771,935	$ 714,337,185
Financial Asset, 30 to 59 Days Past Due [Member]
Total loans	89,332	119,309
Financial Asset, 60 to 89 Days Past Due [Member]
Total loans	1,948,168	1,607,835
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Total loans	19,756,503	12,612,035
Financial Asset, Past Due [Member]
Total loans	21,794,003	14,339,179
Financial Asset, Not Past Due [Member]
Total loans	649,977,932	699,998,006
Residential Portfolio Segment [Member] | Real Estate Loan [Member]
Total loans	449,596,294	472,747,542
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Total loans	69,992	119,309
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Total loans	88,237	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	1,801,822	513,297
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Financial Asset, Past Due [Member]
Total loans	1,960,051	2,240,441
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Financial Asset, Not Past Due [Member]
Total loans	447,636,243	470,507,101
Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member]
Total loans	122,811,801	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	1,859,931	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	7,060,968	1,205,025
Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member] | Financial Asset, Past Due [Member]
Total loans	8,920,899	1,205,025
Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member] | Financial Asset, Not Past Due [Member]
Total loans	113,890,902	116,803,841
Multi-Family Real Estate [Member] | Real Estate Loan [Member]
Total loans	70,364,169	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	70,364,169	74,152,418
Construction Loans [Member] | Real Estate Loan [Member]
Total loans	25,231,859	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	14,338,146	32,289,944
Commercial and Industrial [Member]
Total loans	3,703,476	6,163,747
Commercial and Industrial [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Total loans	19,340	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	19,340	0
Commercial and Industrial [Member] | Financial Asset, Not Past Due [Member]
Total loans	3,684,136	6,163,747
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
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	$ 64,336	$ 80,955

X

- Definition

Amortized cost excluding accrued interest, before 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

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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