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Inventories (Details) - USD ($)	Nov. 30, 2019	Feb. 28, 2019
Inventories Tables Abstract
Raw materials and subassemblies	$ 1,050,183	$ 873,483
Finished goods	598,218	571,640
Contracts in process inventory	706,582
Work in process	802,077	483,271
Total	3,157,060	1,928,394
Less: Allowance	178,280	270,378
Net inventories	$ 2,978,780	$ 1,658,016

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