Annual report pursuant to Section 13 and 15(d)

Intangible Assets - Additional Information (Detail)

v2.4.1.9
Intangible Assets - Additional Information (Detail) (USD $)
12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Finite-Lived Intangible Assets [Line Items]      
Intangible amortization expense $ 229,000us-gaap_AmortizationOfIntangibleAssets $ 222,000us-gaap_AmortizationOfIntangibleAssets $ 228,000us-gaap_AmortizationOfIntangibleAssets
Change in goodwill during the period 0us-gaap_GoodwillPeriodIncreaseDecrease 0us-gaap_GoodwillPeriodIncreaseDecrease  
Goodwill 6,938,000us-gaap_Goodwill 6,938,000us-gaap_Goodwill  
Customer Relationships [Member]      
Finite-Lived Intangible Assets [Line Items]      
Intangible amortization expense 180,000us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
180,000us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
180,000us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Future amortization expenses, 2016 180,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
   
Future amortization expenses, 2017 180,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
   
Future amortization expenses, 2018 180,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
   
Future amortization expenses, 2019 180,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
   
Future amortization expenses, 2020 $ 180,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember