Note 14 - Fair Value - Summarizes Financial Assets Measured at Fair Value (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Fair value, available for sale	$ 26,591,991	$ 27,929,510
Equity security at fair value	503,827	503,881
Fair Value, Measurements, Recurring [Member]
Fair value, available for sale	26,591,991	27,929,510
Equity security at fair value	503,827	503,881
Fair Value, Measurements, Nonrecurring [Member]
Other real estate owned	210,150	265,500
Impaired loans	3,177,381	5,055,969
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Fair value, available for sale
Equity security at fair value	503,827	503,881
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Other real estate owned
Impaired loans
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Fair value, available for sale	26,591,991	27,929,510
Equity security at fair value
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Other real estate owned
Impaired loans
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Fair value, available for sale
Equity security at fair value
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Other real estate owned	210,150	265,500
Impaired loans	3,177,381	5,055,969
US States and Political Subdivisions Debt Securities [Member]
Fair value, available for sale	1,506,505	1,539,207
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair value, available for sale	1,506,505	1,539,207
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Fair value, available for sale
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Fair value, available for sale	1,506,505	1,539,207
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Fair value, available for sale
SBA Pools [Member]
Fair value, available for sale	2,719,372	3,199,846
SBA Pools [Member] | Fair Value, Measurements, Recurring [Member]
Fair value, available for sale	2,719,372	3,199,846
SBA Pools [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Fair value, available for sale
SBA Pools [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Fair value, available for sale	2,719,372	3,199,846
SBA Pools [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Fair value, available for sale
Collateralized Mortgage Backed Securities [Member]
Fair value, available for sale	22,366,114	23,190,457
Collateralized Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair value, available for sale	22,366,114	23,190,457
Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Fair value, available for sale
Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Fair value, available for sale	22,366,114	23,190,457
Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Fair value, available for sale