Inventories (Tables)

12 Months Ended

Mar. 31, 2020

Inventory Disclosure [Abstract]

Schedule of Inventory, Current [Table Text Block]

Inventories consist of:

	March 31,
	2020			2019
Purchased parts	$	3,011,072		$	2,709,235
Work-in-process		597,166			721,397
Finished goods		34,441			-
Less: Allowance for obsolete inventory		(550,000	)		(498,000	)
	$	3,092,679		$	2,932,632