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Earnings Per Share - Basic and diluted earnings per share (Details) - USD ($)	3 Months Ended		6 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Earnings Per Share [Abstract]
Numerator for earnings per share - net income	$ 3,256,341	$ 4,329,701	$ 6,926,802	$ 9,238,889
Denominator:
Denominator for basic earnings per share - weighted average shares	7,621,949	12,190,800	7,619,136	12,184,581
Effect of dilutive securities:
Stock options and other share awards	130,312	173,903	128,722	186,254
Denominator for diluted earnings per share	7,752,261	12,364,703	7,747,858	12,370,835
Earnings per share:
Basic (in dollars per share)	$ 0.43	$ 0.36	$ 0.91	$ 0.76
Diluted (in dollars per share)	$ 0.42	$ 0.35	$ 0.89	$ 0.75

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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