Note 5 - Financial Instruments With Off-balance-sheet Risk - Contract Amounts (Details) - USD ($)	Sep. 30, 2019	Dec. 31, 2018
Financial instruments with off-balance-sheet risk	$ 45,307,662	$ 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	24,940,030	25,323,822
Unused lines of Credit [Member]
Financial instruments with off-balance-sheet risk	$ 20,367,632	$ 18,281,453