Note 12 - Financial Instruments With Off-balance-sheet Risk - Contract Amounts (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Financial instruments with off-balance-sheet risk	$ 43,504,826	$ 77,873,584
Commitments to Originate and Sell Mortgage Loans [Member]
Financial instruments with off-balance-sheet risk		34,268,309
Commitments to Extend Credit [Member]
Financial instruments with off-balance-sheet risk	25,739,246	25,323,822
Unused lines of Credit [Member]
Financial instruments with off-balance-sheet risk	$ 17,765,580	$ 18,281,453