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Accrued expenses (Details) - USD ($)	Feb. 28, 2019	Feb. 28, 2018
Payables and Accruals [Abstract]
Accrued compensation	$ 284,587	$ 362,405
Estimated warranty costs	62,500	64,050
Accrued commissions	100,114	194,934
Professional fees	65,049	64,928
Other accrued expenses	120,456	206,875
Total accrued expenses	$ 632,706	$ 893,192

X

- Definition

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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