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Accrued expenses (Details) - USD ($) | Feb. 28, 2021 | Feb. 29, 2020
--- | --- | ---
Payables and Accruals [Abstract] |  |
Accrued compensation | $ 568,213 | $ 585,875
Estimated warranty costs | 565,700 | 339,275
Accrued commissions | 127,342 | 332,745
Professional fees | 100,559 | 74,492
Other accrued expenses | 389,102 | 281,022
Total accrued expenses | $ 1,750,916 | $ 1,613,409

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