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Inventories (Details) - USD ($)	Aug. 31, 2020	Feb. 29, 2020
Inventories Tables Abstract
Raw materials and subassemblies	$ 1,035,721	$ 967,089
Finished goods	690,835	752,999
Work in process	964,772	855,083
Total	2,691,328	2,575,171
Less: Allowance	(229,280)	(193,280)
Net inventories	$ 2,462,048	$ 2,381,891

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Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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