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Summary of Significant Accounting Policies - Basic and diluted earnings per share (Details 2) (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
Accounting Policies [Abstract]
Numerator for earnings per share - net income	$ 3,847,447us-gaap_NetIncomeLoss	$ 3,769,556us-gaap_NetIncomeLoss	$ 4,329,701us-gaap_NetIncomeLoss	$ 4,909,188us-gaap_NetIncomeLoss	$ 2,859,539us-gaap_NetIncomeLoss	$ 3,826,768us-gaap_NetIncomeLoss	$ 4,316,552us-gaap_NetIncomeLoss	$ 5,700,493us-gaap_NetIncomeLoss	$ 16,855,892us-gaap_NetIncomeLoss	$ 16,703,352us-gaap_NetIncomeLoss	$ 19,940,946us-gaap_NetIncomeLoss
Denominator:
Denominator for basic earnings per share - weighted average shares									12,012,765us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	12,096,372us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	11,977,174us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive securities:
Stock options and other share awards									178,991us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	228,873us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	241,242us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Denominator for diluted earnings per share									12,191,756us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	12,325,245us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	12,218,416us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Earnings per share - basic (in dollars per share)	$ 0.34us-gaap_EarningsPerShareBasic	$ 0.31us-gaap_EarningsPerShareBasic	$ 0.36us-gaap_EarningsPerShareBasic	$ 0.40us-gaap_EarningsPerShareBasic	$ 0.24us-gaap_EarningsPerShareBasic	$ 0.32us-gaap_EarningsPerShareBasic	$ 0.36us-gaap_EarningsPerShareBasic	$ 0.47us-gaap_EarningsPerShareBasic	$ 1.40us-gaap_EarningsPerShareBasic	$ 1.38us-gaap_EarningsPerShareBasic	$ 1.66us-gaap_EarningsPerShareBasic
Earnings per share - diluted (in dollars per share)	$ 0.33us-gaap_EarningsPerShareDiluted	$ 0.30us-gaap_EarningsPerShareDiluted	$ 0.35us-gaap_EarningsPerShareDiluted	$ 0.40us-gaap_EarningsPerShareDiluted	$ 0.23us-gaap_EarningsPerShareDiluted	$ 0.31us-gaap_EarningsPerShareDiluted	$ 0.35us-gaap_EarningsPerShareDiluted	$ 0.46us-gaap_EarningsPerShareDiluted	$ 1.38us-gaap_EarningsPerShareDiluted	$ 1.36us-gaap_EarningsPerShareDiluted	$ 1.63us-gaap_EarningsPerShareDiluted

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