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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)