Inventories

12 Months Ended

Mar. 31, 2021

Inventory Disclosure [Abstract]

Inventory Disclosure [Text Block]

4.                   Inventories

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

Work-in-process inventory includes $1,003,514 and $516,431 for government contracts on March 31, 2021, and 2020, respectively.