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Accrued expenses (Details) - USD ($) | Feb. 29, 2020 | Feb. 28, 2019
--- | --- | ---
Payables and Accruals [Abstract] |  |
Accrued compensation | $ 585,875 | $ 284,587
Estimated warranty costs | 339,275 | 62,500
Accrued commissions | 332,745 | 100,114
Professional fees | 74,492 | 65,049
Other accrued expenses | 281,022 | 120,456
Total accrued expenses | $ 1,613,409 | $ 632,706

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