Note 14 - Fair Value - Summarizes Financial Assets Measured at Fair Value (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Fair value, available for sale	$ 36,531,774	$ 26,591,991
Equity security at fair value	532,321	503,827
Fair Value, Recurring [Member]
Fair value, available for sale	36,531,774	26,591,991
Equity security at fair value	532,321	503,827
Fair Value, Nonrecurring [Member]
Other real estate owned		210,150
Impaired loans	2,135,045	3,177,381
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]
Fair value, available for sale
Equity security at fair value	532,321	503,827
Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member]
Other real estate owned
Impaired loans
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]
Fair value, available for sale	36,531,774	26,591,991
Equity security at fair value
Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member]
Other real estate owned
Impaired loans
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Fair value, available for sale
Equity security at fair value
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member]
Other real estate owned		210,150
Impaired loans	2,135,045	3,177,381
US States and Political Subdivisions Debt Securities [Member]
Fair value, available for sale	512,670	1,506,505
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member]
Fair value, available for sale	512,670	1,506,505
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]
Fair value, available for sale
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]
Fair value, available for sale	512,670	1,506,505
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Fair value, available for sale
SBA Pools [Member]
Fair value, available for sale	2,151,797	2,719,372
SBA Pools [Member] | Fair Value, Recurring [Member]
Fair value, available for sale	2,151,797	2,719,372
SBA Pools [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]
Fair value, available for sale
SBA Pools [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]
Fair value, available for sale	2,151,797	2,719,372
SBA Pools [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Fair value, available for sale
Collateralized Mortgage Backed Securities [Member]
Fair value, available for sale	33,867,307	22,366,114
Collateralized Mortgage Backed Securities [Member] | Fair Value, Recurring [Member]
Fair value, available for sale	33,867,307	22,366,114
Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]
Fair value, available for sale
Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]
Fair value, available for sale	33,867,307	22,366,114
Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Fair value, available for sale