Note 13 - Fair Value Measurements - Investment Securities Available for Sale, Measurements On Recurring Basis (Details) - USD ($)	Dec. 31, 2016	Mar. 31, 2016
Securities available for sale, at fair value	$ 106,754,363	$ 70,484,400
Fair Value, Inputs, Level 1 [Member]
Securities available for sale, at fair value
Fair Value, Inputs, Level 2 [Member]
Securities available for sale, at fair value	104,840,835	68,585,760
Fair Value, Inputs, Level 3 [Member]
Securities available for sale, at fair value	1,913,528	1,898,640
US Government Agencies Debt Securities [Member]
Securities available for sale, at fair value	3,509,405	10,532,996
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Securities available for sale, at fair value
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available for sale, at fair value	3,509,405	10,532,996
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Securities available for sale, at fair value
Municipal Bonds [Member]
Securities available for sale, at fair value	16,148,962	4,112,564
Municipal Bonds [Member] | Fair Value, Inputs, Level 1 [Member]
Securities available for sale, at fair value
Municipal Bonds [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available for sale, at fair value	16,148,962	4,112,564
Municipal Bonds [Member] | Fair Value, Inputs, Level 3 [Member]
Securities available for sale, at fair value
Corporate Bond Securities [Member]
Securities available for sale, at fair value	1,913,528	1,898,640
Corporate Bond Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Securities available for sale, at fair value
Corporate Bond Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available for sale, at fair value
Corporate Bond Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Securities available for sale, at fair value	1,913,528	1,898,640
Collateralized Mortgage Backed Securities [Member]
Securities available for sale, at fair value	85,182,468	53,940,200
Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Securities available for sale, at fair value
Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available for sale, at fair value	85,182,468	53,940,200
Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Securities available for sale, at fair value