Inventories (Tables)

12 Months Ended

Mar. 31, 2021

Inventory Disclosure [Abstract]

Schedule of Inventory, Current [Table Text Block]

Inventories consist of:

	March 31,
	2021			2020
Purchased parts	$	2,912,599		$	3,011,072
Work-in-process		1,020,402			597,166
Finished goods		79,988			34,441
Less: Allowance for obsolete inventory		(575,000	)		(550,000	)
	$	3,437,989		$	3,092,679