Segment information and revenue analysis (Details 1) - USD ($)	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025
Total revenues	$ 1,864,869	$ 3,443,594
Mainland China [Member]
Total revenues	1,864,869	3,443,594
Outside Mainland China [Member]
Total revenues
Total Revenues [Member]
Total revenues	$ 1,864,869	$ 3,443,594

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