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Inventories (Details) - USD ($)	Aug. 31, 2019	Feb. 28, 2019
Inventories Tables Abstract
Raw materials and subassemblies	$ 862,495	$ 873,483
Finished goods	573,923	571,640
Contracts in process inventory	739,471
Work in process	563,305	483,271
Total	2,739,194	1,928,394
Less: Allowance	160,280	270,378
Net inventories	$ 2,578,914	$ 1,658,016

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