Note 6 - Inventories, net (Details) - Schedule of Inventory, Current - USD ($)	Sep. 30, 2019	Mar. 31, 2019
Schedule of Inventory, Current [Abstract]
Purchased parts	$ 2,525,184	$ 2,709,235
Work-in-process	1,042,431	721,397
Finished goods	32,783	0
Less: Allowance for obsolete inventory	(525,000)	(498,000)
Inventory, net	$ 3,075,398	$ 2,932,632

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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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