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Description of Business and Summary of Significant Accounting Policies (Details) (USD $)
6 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Mar. 31, 2014
Prepaid Expense and Other Assets, Current [Abstract]      
Prepaid expenses and other current assets $ 1,500,000   $ 1,300,000
Prior Period Reclassification Adjustment   516,000  
Cash and Cash Equivalents      
Cash designated as collateral on performance bonds $ 520,000    
Percentage of cash value of the bonds as collateral 100.00%    
Minimum | Property and equipment
     
Property and Equipment      
Useful life 3 years    
Warranty      
Warranty period 1 year    
Maximum
     
Costs in Excess of Billings on Uncompleted Contracts      
Expected period for unbilled amounts to be billed and collected 12 months    
Billings in Excess of Costs and Estimated Earnings on Uncompleted Contracts      
Expected period for unearned amounts to be earned 12 months    
Maximum | Property and equipment
     
Property and Equipment      
Useful life 8 years    
Warranty      
Warranty period 3 years