Note 11 - Fair Value Measurement and Disclosure - Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($)	Sep. 30, 2016	Dec. 31, 2015
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Securities available for sale	$ 0	$ 0
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Securities available for sale	19,013,596	19,237,208
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Securities available for sale	0	0
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]
Securities available for sale	19,013,596	19,237,208
US States and Political Subdivisions Debt Securities [Member]
Securities available for sale	19,013,596	19,237,208
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Securities available for sale	0	0
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Securities available for sale	25,135,943	27,747,699
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Securities available for sale	0	0
Residential Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Securities available for sale	25,135,943	27,747,699
Residential Mortgage Backed Securities [Member]
Securities available for sale	25,135,943	27,747,699
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Securities available for sale	0	0
Fair Value, Inputs, Level 1 [Member]
Securities available for sale	0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Securities available for sale	44,149,539	46,984,907
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Securities available for sale	0	0
Fair Value, Inputs, Level 3 [Member]
Securities available for sale	0
Fair Value, Measurements, Recurring [Member]
Securities available for sale	44,149,539	46,984,907
Securities available for sale	$ 44,149,539	$ 46,984,907