Inventories, net (Tables)

6 Months Ended

Sep. 30, 2020

Inventory Disclosure [Abstract]

Schedule of Inventory, Current [Table Text Block]

Inventories consist of:

	September 30, 2020			March 31, 2020
Purchased parts	$	2,744,088		$	3,011,072
Work-in-process		858,774			597,166
Finished goods		16,035			34,441
Less: Inventory reserve		(570,000	)		(550,000	)
	$	3,048,897		$	3,092,679