4. Inventories (Details) - Schedule of Inventory, Current - USD ($)	Mar. 31, 2019	Mar. 31, 2018
Schedule of Inventory, Current [Abstract]
Purchased parts	$ 2,709,235	$ 3,571,874
Work-in-process	721,397	1,051,725
Finished goods	0	66,335
Less: Allowance for obsolete inventory	(498,000)	(420,000)
Inventory, net	$ 2,932,632	$ 4,269,934

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Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Amount before valuation and LIFO reserves of other supplies used within the manufacturing or production process expected to be consumed within one year or operating cycle, if longer.

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