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Inventories, net (Details) - Schedule of Inventory, Current - USD ($)
Dec. 31, 2019
Mar. 31, 2019
Schedule of Inventory, Current [Abstract]    
Purchased parts $ 2,548,252 $ 2,709,235
Work-in-process 967,462 721,397
Finished goods 109,815 0
Less: Allowance for obsolete inventory (555,000) (498,000)
Inventory, net $ 3,070,529 $ 2,932,632