Annual report pursuant to Section 13 and 15(d)

Intangible Assets - Additional Information (Detail)

v3.6.0.2
Intangible Assets - Additional Information (Detail) - USD ($)
 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Finite Lived Intangible Assets [Line Items]      
Intangible amortization expense $ 234,000 $ 229,000 $ 222,000
Change in goodwill during the period 0 0  
Goodwill 6,938,000 6,938,000  
Customer Relationships [Member]      
Finite Lived Intangible Assets [Line Items]      
Intangible amortization expense 180,000 $ 180,000 $ 180,000
Future amortization expenses, 2017 180,000    
Future amortization expenses, 2018 180,000    
Future amortization expenses, 2019 180,000    
Future amortization expenses, 2020 180,000    
Future amortization expenses, 2021 $ 180,000