Earnings Per Share - Basic and diluted earnings per share (Details) - USD ($)	3 Months Ended		9 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Earnings Per Share [Abstract]
Numerator for earnings per share - net income	$ 2,726,901	$ 3,769,556	$ 9,653,703	$ 13,008,445
Denominator:
Denominator for basic earnings per share - weighted average shares	7,622,981	12,197,125	7,620,423	12,188,778
Effect of dilutive securities:
Stock options and other share awards	148,404	178,214	157,141	183,220
Denominator for diluted earnings per share	7,771,385	12,375,339	7,777,564	12,371,998
Earnings per share:
Basic (in dollars per share)	$ 0.36	$ 0.31	$ 1.27	$ 1.07
Diluted (in dollars per share)	$ 0.35	$ 0.30	$ 1.24	$ 1.05