Inventories, net (Details) - Schedule of Inventory, Current - USD ($)	Dec. 31, 2020	Mar. 31, 2020
Schedule of Inventory, Current [Abstract]
Purchased parts	$ 2,408,455	$ 3,011,072
Work-in-process	1,043,772	597,166
Finished goods	53,637	34,441
Less: Allowance for obsolete inventory	(575,000)	(550,000)
Inventory, net	$ 2,930,864	$ 3,092,679

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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 of valuation reserve for inventory.

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Amount before valuation and LIFO reserves of merchandise or goods in the production process expected to be completed 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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