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Inventories (Details) - USD ($) | Feb. 29, 2020 | Feb. 28, 2019
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Inventories Tables Abstract |  |
Raw materials | $ 967,089 | $ 873,483
Finished goods | 752,999 | 571,640
Work in process | 855,083 | 483,271
Total | 2,575,171 | 1,928,394
Less: Allowance | 193,280 | 270,378
Net inventories | $ 2,381,891 | $ 1,658,016

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