Note 11 - Fair Value Measurement and Disclosure - Assets Measured at Fair Value On a Non-recurring Basis (Details) - Fair Value, Measurements, Nonrecurring [Member] - USD ($)	Sep. 30, 2016	Dec. 31, 2015
Fair Value, Inputs, Level 1 [Member]
Foreclosed assets	$ 0	$ 0
Impaired loans, net	0	0
Fair Value, Inputs, Level 2 [Member]
Foreclosed assets	0	0
Impaired loans, net	0	0
Fair Value, Inputs, Level 3 [Member]
Foreclosed assets	74,753	330,245
Impaired loans, net	2,584,583	2,277,918
Foreclosed assets	74,753	330,245
Impaired loans, net	$ 2,584,583	$ 2,277,918