Note 8 - Loans Receivable, Net - Loans in Nonaccrual Status (Details) - USD ($)	Jun. 30, 2023	Dec. 31, 2022
Nonaccrual with no allowance	$ 6,555,925
Nonaccrual with an allowance	0
Nonaccrual	6,555,925	$ 6,271,230
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Nonaccrual with no allowance	244,776
Nonaccrual with an allowance	0
Nonaccrual	244,776	114,630
Commercial Real Estate Portfolio Segment [Member] | Residential Mortgage [Member]
Nonaccrual with no allowance	1,327,575
Nonaccrual with an allowance	0
Nonaccrual	1,327,575	1,544,762
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member]
Nonaccrual with no allowance	4,373,266
Nonaccrual with an allowance	0
Nonaccrual	4,373,266	4,281,975
Commercial and Agricultural Loans [Member]
Nonaccrual with no allowance	63,020
Nonaccrual with an allowance	0
Nonaccrual	63,020	112,652
Consumer Portfolio Segment [Member] | Home Equity Line of Credit [Member]
Nonaccrual with no allowance	467,365
Nonaccrual with an allowance	0
Nonaccrual	467,365	188,540
Consumer Portfolio Segment [Member] | Other Consumer Loans [Member]
Nonaccrual with no allowance	79,923
Nonaccrual with an allowance	0
Nonaccrual	$ 79,923	$ 28,671