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

Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for professional fees, such as for legal and accounting services received.

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Carrying value as of the balance sheet date of the obligations incurred through that date and payable for employees' services provided. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for sales commissions.

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Amount of expenses incurred but not yet paid classified as other.

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers.

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