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Note 2 - Securities Available for Sale - Schedule of Debt Securities in an Unrealized Loss Position (Details) - USD ($) | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Available for sale, fair value, less than 12 months | $ 4,141,353 | $ 43,739,606
Available for sale, unrealized losses, less than 12 months | (64,393) | (120,511)
Available for sale, fair value, 12 months or more | 39,783,037 | 55,231,941
Available for sale, unrealized losses, 12 months or more | (4,415,697) | (5,993,750)
Available for sale, fair value | 43,924,390 | 98,971,547
Available for sale, unrealized losses | (4,480,090) | (6,114,261)
US Government Agencies Debt Securities [Member] |  |
Available for sale, fair value, less than 12 months | 0 | 0
Available for sale, unrealized losses, less than 12 months | 0 | 0
Available for sale, fair value, 12 months or more | 2,929,179 | 12,792,540
Available for sale, unrealized losses, 12 months or more | (70,821) | (207,460)
Available for sale, fair value | 2,929,179 | 12,792,540
Available for sale, unrealized losses | (70,821) | (207,460)
Corporate Debt Securities [Member] |  |
Available for sale, fair value, less than 12 months | 3,433,035 | 0
Available for sale, unrealized losses, less than 12 months | (60,112) | 0
Available for sale, fair value, 12 months or more | 11,226,252 | 15,965,261
Available for sale, unrealized losses, 12 months or more | (1,002,413) | (1,453,923)
Available for sale, fair value | 14,659,287 | 15,965,261
Available for sale, unrealized losses | (1,062,525) | (1,453,923)
US States and Political Subdivisions Debt Securities [Member] |  |
Available for sale, fair value, less than 12 months | 0 | 0
Available for sale, unrealized losses, less than 12 months | 0 | 0
Available for sale, fair value, 12 months or more | 424,280 | 398,275
Available for sale, unrealized losses, 12 months or more | (81,653) | (108,431)
Available for sale, fair value | 424,280 | 398,275
Available for sale, unrealized losses | (81,653) | (108,431)
Residential Mortgage-Backed Securities [Member] |  |
Available for sale, fair value, less than 12 months | 708,318 | 43,739,606
Available for sale, unrealized losses, less than 12 months | (4,281) | (120,511)
Available for sale, fair value, 12 months or more | 13,471,456 | 11,741,816
Available for sale, unrealized losses, 12 months or more | (1,607,056) | (2,042,162)
Available for sale, fair value | 14,179,774 | 55,481,422
Available for sale, unrealized losses | (1,611,337) | (2,162,673)
Commercial Mortgage-Backed Securities [Member] |  |
Available for sale, fair value, less than 12 months | 0 | 0
Available for sale, unrealized losses, less than 12 months | 0 | 0
Available for sale, fair value, 12 months or more | 11,731,870 | 14,334,049
Available for sale, unrealized losses, 12 months or more | (1,653,754) | (2,181,774)
Available for sale, fair value | 11,731,870 | 14,334,049
Available for sale, unrealized losses | $ (1,653,754) | $ (2,181,774)

X
- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479081/326-30-55-8 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-7 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-5 + Details
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