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Inventories (Details) - USD ($) | Feb. 28, 2021 | Feb. 29, 2020
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Inventories Tables Abstract |  |
Raw materials | $ 1,081,591 | $ 967,089
Finished goods | 786,785 | 752,999
Work in process | 1,027,010 | 855,083
Total | 2,895,386 | 2,575,171
Less: Allowance | (284,280) | (193,280)
Net inventories | $ 2,611,106 | $ 2,381,891

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