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Intangible Assets, Amortization Expense (Details) (USD $)
12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Amortization expense for acquired intangible assets [Abstract]      
Amortization expense $ 670,000us-gaap_AmortizationOfIntangibleAssets $ 739,000us-gaap_AmortizationOfIntangibleAssets $ 773,000us-gaap_AmortizationOfIntangibleAssets
Estimated future amortization expense for intangible assets subject to amortization [Abstract]      
2016 349,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths    
2017 266,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo    
2018 266,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree    
2019 266,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour    
2020 266,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive    
Thereafter 1,161,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive    
Total $ 2,574,000us-gaap_FiniteLivedIntangibleAssetsNet