Note 14 - Income Taxes - Summary of Tax Effects of Temporary Differences that Gave Rise to Deferred Tax Assets and Liabilities (Details) - USD ($)	Mar. 31, 2017	Mar. 31, 2016
Allowance for loan losses	$ 887,510	$ 688,066
Nonaccrual interest	197,363	194,900
Deferred compensation	822,939	156,164
Foreclosed real estate write down and holding costs	221,010	221,010
Deferred loan costs	42,285	35,070
Capital loss carryforward	48,872
Charitable contribution carryforward	42,098	38,101
Net operating loss carryforward	4,414,529	625,612
Stock based payment awards	80,833	64,799
Unrealized loss on investment securities available for sale	862,673	14,410
AMT credit carryover	225,294	169,728
Acquisition activity	1,078,763	969,105
Total deferred tax assets	8,924,169	3,176,965
Valuation allowance on deferred tax asset	(42,364)	(21,218)
Total deferred tax asset, net	8,881,805	3,155,747
FHLB stock dividends	91,004	67,245
Goodwill and other intangible assets	717,933	588,727
Accumulated depreciation	65,193	93,576
Other	30,825	53,058
Total deferred tax liabilities	904,955	802,606
Net deferred tax asset	$ 7,976,850	$ 2,353,141