Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Assets
Allowance for loan losses	$ 3,846,517	$ 3,626,908
Stockholders' equity
Preferred stock, shares authorized (in shares)	1,000,000	1,000,000
Common stock, shares authorized (in shares)	9,000,000	9,000,000
Common stock, par value (in dollars per share)	$ 0	$ 0
Common stock, shares issued (in shares)	3,444,709	3,549,665
Common stock, shares outstanding (in shares)	3,444,709	3,549,665
Preferred Stock Series A [Member]
Stockholders' equity
Preferred stock, shares issued (in shares)	189,356	189,356
Preferred stock, shares outstanding (in shares)	189,356	189,356
Preferred stock, par value (in dollars per share)	$ 0	$ 0
Preferred stock, dividend rate	4.50%	4.50%
Preferred stock, liquidation value (in dollars per share)	$ 14	$ 14
Preferred Stock Series D [Member]
Stockholders' equity
Preferred stock, shares issued (in shares)	181,154	181,154
Preferred stock, shares outstanding (in shares)	181,154	181,154
Preferred stock, par value (in dollars per share)	$ 0	$ 0
Preferred stock, dividend rate	5.00%	5.00%
Preferred stock, liquidation value (in dollars per share)	$ 7.08	$ 7.08
Common Stock Class A [Member]
Stockholders' equity
Common stock, shares authorized (in shares)	1,000,000	1,000,000
Common stock, par value (in dollars per share)	$ 0	$ 0
Common stock, shares issued (in shares)	104,956
Common stock, shares outstanding (in shares)	104,956