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Inventories (Details) - USD ($)	May 31, 2019	Feb. 28, 2019
Inventories Tables Abstract
Raw materials and subassemblies	$ 906,384	$ 873,483
Finished goods	511,267	571,640
Contracts in process inventory	600,204
Work in process	645,243	483,271
Total	2,663,098	1,928,394
Less: Allowance	284,378	270,378
Net inventories	$ 2,378,720	$ 1,658,016

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