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Earnings Per Share (Details) (USD $)	3 Months Ended		6 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Earnings Per Share [Abstract]
Numerator for earnings per share - net income	$ 5,161,950	$ 5,520,104	$ 10,535,475	$ 10,822,897
Denominator:
Denominator for basic earnings per share - weighted average shares	11,963,596	11,772,819	11,956,362	11,709,875
Effect of dilutive securities:
Effect of dilutive securities:Stock options and other share awards	$ 218,469	$ 254,642	$ 232,939	$ 291,914
Denominator for diluted earnings per share	12,182,065	12,027,461	12,189,301	12,001,789
Earnings per share
Basic	$ 0.43	$ 0.47	$ 0.88	$ 0.92
Diluted	$ 0.42	$ 0.46	$ 0.86	$ 0.90

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