Quarterly Results of Operations (Unaudited) - Summary (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Quarterly Financial Data [Abstract]
Total revenue	$ 21,933,607	$ 21,800,765	$ 21,723,072	$ 21,332,514	$ 20,443,054	$ 20,761,230	$ 20,948,924	$ 20,475,735
Interest expense	1,578,737	1,457,919	1,485,193	1,448,585	1,389,209	1,441,175	1,442,898	1,404,906	5,970,434	5,678,188	5,120,827
Provision for credit losses	5,187,832	5,796,648	5,154,235	4,231,815	4,181,286	4,183,035	3,973,104	2,641,791	20,370,530	14,979,216	13,391,875
Non-interest expense	8,935,129	8,407,719	8,088,886	8,920,889	9,484,125	8,477,233	8,329,886	7,163,565
Operating income before income taxes	6,231,909	6,138,479	6,994,758	6,731,225	5,388,434	6,659,787	7,203,036	9,265,473	26,096,371	28,516,730	32,486,155
Income tax expense	2,384,462	2,368,923	2,665,057	1,822,037	2,528,895	2,833,019	2,886,484	3,564,980	9,240,479	11,813,378	12,545,209
Net income	$ 3,847,447	$ 3,769,556	$ 4,329,701	$ 4,909,188	$ 2,859,539	$ 3,826,768	$ 4,316,552	$ 5,700,493	$ 16,855,892	$ 16,703,352	$ 19,940,946
Earnings per share:
Basic (in dollars per share)	$ 0.34	$ 0.31	$ 0.36	$ 0.40	$ 0.24	$ 0.32	$ 0.36	$ 0.47	$ 1.40	$ 1.38	$ 1.66
Diluted (in dollars per share)	$ 0.33	$ 0.30	$ 0.35	$ 0.40	$ 0.23	$ 0.31	$ 0.35	$ 0.46	$ 1.38	$ 1.36	$ 1.63
Dividends per share (in dollars per share)							$ 0.12	$ 0.12		$ 0.24	$ 2.46