Note 6 - Goodwill and Intangibles - Core Deposit Intangibles (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2016	Dec. 31, 2015
Balance at the beginning of the period	$ 1,471,409	$ 1,670,921
Amortization expense	(442,849)	(199,512)	$ (199,512)
Balance at the end of the period	7,381,213	1,471,409	1,670,921
Net book value	7,381,213	1,471,409	1,670,921	$ 7,381,213	$ 1,471,409
Core Deposits [Member]
Balance at the beginning of the period	1,471,409	1,670,921
Core deposit intangibles from acquisition of CSB	6,352,653
Amortization expense	(442,849)	(199,512)
Balance at the end of the period	7,381,213	1,471,409	1,670,921
Gross carrying amount				8,347,780	1,995,127
Accumulated amortization				(966,567)	(523,718)
Net book value	$ 1,471,409	$ 1,471,409	$ 1,670,921	$ 7,381,213	$ 1,471,409