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4. Inventories (Details) - Schedule of Inventory, Current - USD ($)
Mar. 31, 2017
Mar. 31, 2016
Schedule of Inventory, Current [Abstract]    
Purchased parts $ 3,197,378 $ 3,420,249
Work-in-process 1,272,235 1,446,293
Finished goods 68,566 102,490
Less: Allowance for obsolete inventory (330,000) (290,000)
$ 4,208,179 $ 4,679,032