Note 19 - Fair Value Measurements - Investment Securities Available for Sale, Measurements On Recurring Basis (Details) - USD ($)	Mar. 31, 2017	Mar. 31, 2016
Investment securities available for sale, at fair value	$ 102,429,128	$ 70,484,400
Fair Value, Inputs, Level 1 [Member]
Investment securities available for sale, at fair value
Fair Value, Inputs, Level 2 [Member]
Investment securities available for sale, at fair value	100,498,342	68,585,760
Fair Value, Inputs, Level 3 [Member]
Investment securities available for sale, at fair value	1,930,786	1,898,640
US Government Agencies Debt Securities [Member]
Investment securities available for sale, at fair value	3,512,303	10,532,996
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Investment securities available for sale, at fair value
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Investment securities available for sale, at fair value	3,512,303	10,532,996
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Investment securities available for sale, at fair value
Municipal Bonds [Member]
Investment securities available for sale, at fair value	16,167,839	4,112,564
Municipal Bonds [Member] | Fair Value, Inputs, Level 1 [Member]
Investment securities available for sale, at fair value
Municipal Bonds [Member] | Fair Value, Inputs, Level 2 [Member]
Investment securities available for sale, at fair value	14,239,526	4,112,564
Municipal Bonds [Member] | Fair Value, Inputs, Level 3 [Member]
Investment securities available for sale, at fair value	1,928,313
Corporate Bond Securities [Member]
Investment securities available for sale, at fair value	1,916,522	1,898,640
Corporate Bond Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Investment securities available for sale, at fair value
Corporate Bond Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Investment securities available for sale, at fair value	1,916,522
Corporate Bond Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Investment securities available for sale, at fair value		1,898,640
Collateralized Mortgage Backed Securities [Member]
Investment securities available for sale, at fair value	80,832,464	53,940,200
Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Investment securities available for sale, at fair value
Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Investment securities available for sale, at fair value	80,829,991	53,940,200
Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Investment securities available for sale, at fair value	$ 2,473