Note 11 - Financial Instruments With Off-balance-sheet Risk - Contract Amounts (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Financial instruments with off-balance-sheet risk	$ 77,873,584	$ 64,567,968
Commitments to Originate and Sell Mortgage Loans [Member]
Financial instruments with off-balance-sheet risk	34,268,309	27,440,793
Commitments to Extend Credit [Member]
Financial instruments with off-balance-sheet risk	25,323,822	23,425,182
Unused lines of Credit [Member]
Financial instruments with off-balance-sheet risk	18,281,453	13,576,993
Standby Letters of Credit 1 [Member]
Financial instruments with off-balance-sheet risk		$ 125,000