Note 8 - Loans Receivable, Net - Loans in Nonaccrual Status (Details) - USD ($)	Sep. 30, 2023	Dec. 31, 2022
Nonaccrual with no allowance	$ 6,338,772
Nonaccrual with an allowance	0
Nonaccrual	6,338,772	$ 6,271,230
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Nonaccrual with no allowance	234,252
Nonaccrual with an allowance	0
Nonaccrual	234,252	114,630
Commercial Real Estate Portfolio Segment [Member] | Residential Mortgage [Member]
Nonaccrual with no allowance	1,296,522
Nonaccrual with an allowance	0
Nonaccrual	1,296,522	1,544,762
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member]
Nonaccrual with no allowance	4,238,537
Nonaccrual with an allowance	0
Nonaccrual	4,238,537	4,281,975
Commercial and Agricultural Loans [Member]
Nonaccrual with no allowance	52,886
Nonaccrual with an allowance	0
Nonaccrual	52,886	112,652
Consumer Portfolio Segment [Member] | Home Equity Line of Credit [Member]
Nonaccrual with no allowance	420,484
Nonaccrual with an allowance	0
Nonaccrual	420,484	188,540
Consumer Portfolio Segment [Member] | Other Consumer Loans [Member]
Nonaccrual with no allowance	96,091
Nonaccrual with an allowance	0
Nonaccrual	$ 96,091	$ 28,671