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Commitments and Contingencies (Details) (USD $)
12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Future minimum lease payments under noncancelable operating leases      
2015 $ 513,000    
2016 438,000    
2017 230,000    
2018 112,000    
2019 and thereafter 109,000    
Total minimum lease payments 1,402,000    
Rent expense 708,000 805,000 813,000
Present value of the lease obligations $ 467,000    
Maximum duration of service warranties 30 days