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Stock-based compensation - summary of stock options (Details) - $ / shares	12 Months Ended
	Feb. 28, 2025	Feb. 29, 2024	Feb. 28, 2023
Equity [Abstract]
Stock Options outstanding at beginning of period (in shares)	295,542	250,759
Stock Options exercisable at beginning of period (in shares)	181,376	133,609
Weighted Average outstanding at beginning of period (in dollars per share)	$ 4.99	$ 4.84
Weighted Average exercisable at beginning of period (in dollars per share)	$ 4.89	$ 4.62
Weighted average remaining term outstanding	7 years 11 months 4 days	8 years 14 days	8 years 6 months 7 days
Granted (in shares)	161,323	73,193
Granted (in dollars per share)	$ 4.13	$ 5.02
Exercised (in shares)	(1,209)	(19,701)
Exercised (in dollars per share)	$ (3.19)	$ (3.62)
Cancelled (in shares)	(27,657)	(8,709)
Cancelled (in dollars per share)	$ (5.49)	$ (4.20)
Stock Options outstanding at end of period (in shares)	427,999	295,542	250,759
Stock Options exercisable at end of period (in shares)	226,913	181,376	133,609
Weighted Average outstanding at end of period (in dollars per share)	$ 4.64	$ 4.99	$ 4.84
Weighted Average exercisable at end of period (in dollars per share)	$ 4.90	$ 4.89	$ 4.62

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
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-Name Accounting Standards Codification
-Section 50
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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

+ References

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Weighted average price of options that were either forfeited or expired.

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Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of share options (or share units) exercised during the current period.

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