Summary of significant accounting policies - Schedule of Disaggregation of Revenue (Details) - USD ($)	12 Months Ended
Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024
Disaggregation of Revenue [Line Items]
Total revenue	$ 10,265,613	$ 7,722,510	$ 4,885,916
Overseas Sales of Products [Member]
Disaggregation of Revenue [Line Items]
Total revenue	3,095,591	3,319,714
Domestic Sales of Products [Member]
Disaggregation of Revenue [Line Items]
Total revenue	$ 7,170,022	$ 4,402,796

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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+ Details