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Income Taxes - Components of the income tax provision (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Current taxes
Federal	$ 9,303us-gaap_CurrentFederalTaxExpenseBenefit	$ 9,689us-gaap_CurrentFederalTaxExpenseBenefit	$ 9,588us-gaap_CurrentFederalTaxExpenseBenefit
State	885	921	913
Total current taxes	10,188us-gaap_CurrentIncomeTaxExpenseBenefit	10,610us-gaap_CurrentIncomeTaxExpenseBenefit	10,501us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred taxes
Federal	143	(167)	(329)
State	14	(16)	(31)
Total deferred taxes	157	(183)	(360)
Total provision for income taxes	$ 10,345us-gaap_IncomeTaxExpenseBenefit	$ 10,427us-gaap_IncomeTaxExpenseBenefit	$ 10,141us-gaap_IncomeTaxExpenseBenefit

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

Amount of current state and local tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred state and local tax expense (benefit) pertaining to income (loss) from continuing operations.