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6. Accrued Expenses (Details) - Schedule of Product Warranty Liability - USD ($)
12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Schedule of Product Warranty Liability [Abstract]    
Warranty reserve, at beginning of period $ 188,444 $ 208,102
Warranty expense 4,823 107,735
Warranty deductions (81,284) (127,393)
Warranty reserve, at end of period $ 111,983 $ 188,444