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Earnings Per Share - Basic and diluted earnings per share (Details) - USD ($)	3 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Earnings Per Share [Abstract]
Numerator for earnings per share - net income	$ 3,670,461	$ 4,909,188
Denominator:
Denominator for basic earnings per share - weighted average shares	7,616,293	12,178,293
Effect of dilutive securities:
Stock options and other share awards	127,469	184,909
Denominator for diluted earnings per share	7,743,762	12,363,202
Earnings per share:
Basic (in dollars per share)	$ 0.48	$ 0.40
Diluted (in dollars per share)	$ 0.47	$ 0.40

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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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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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