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Inventories (Details) - USD ($) | Feb. 28, 2019 | Feb. 28, 2018
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Inventories Tables Abstract |  |
Raw materials | $ 873,483 | $ 673,969
Finished goods | 571,640 | 395,410
Work in process | 483,271 | 489,082
Total | 1,928,394 | 1,558,461
Less: Allowance | 270,378 | 204,378
Net inventories | $ 1,658,016 | $ 1,354,083

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