Inventories

12 Months Ended

Mar. 31, 2022

Inventory Disclosure [Abstract]

Inventory Disclosure [Text Block]

4. Inventories

Inventories consist of:

	March 31,
	2022			2021
Purchased parts	$	2,371,105		$	2,912,599
Work-in-process		962,460			1,020,402
Finished goods		-			79,988
Less: Allowance for obsolete inventory		(513,068	)		(575,000	)
	$	2,820,497		$	3,437,989

Work-in-process inventory includes $838,490 and $1,003,514 for government contracts on March 31, 2022, and 2021, respectively.