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Stock-based compensation, Stock Option Activity (Details) - Stock Option Plan [Member] - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended	12 Months Ended
	Sep. 30, 2024	Mar. 31, 2024
Number of options [Roll Forward]
Outstanding at beginning of period (in shares)	721,793
Granted (in shares)	198,130
Outstanding at end of period (in shares)	453,681	721,793
Exercisable (in shares)	919,923
Weighted Average Exercise Price [Abstract]
Outstanding at beginning of period (in dollars per share)	$ 3.68
Granted (in dollars per share)	2.96
Outstanding at end of period (in dollars per share)	3.53	$ 3.68
Exercisable (in dollars per share)	$ 4.22
Remaining Contractual Term (years) [Abstract]
Outstanding remaining contractual term (years)	8 years 9 months 18 days	9 years 29 days
Exercisable remaining contractual term (years)	8 years 5 months 23 days
Aggregate Intrinsic Value [Abstract]
Aggregate intrinsic value beginning	$ 527
Aggregate intrinsic value ending	294	$ 527
Aggregate intrinsic value, exercisable	$ 162

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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.

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

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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