Segment information (Details) - USD ($)	3 Months Ended
Segment information (Details) - USD ($)	Mar. 31, 2026	Mar. 31, 2025
Total formation and operating costs	$ (364,905)	$ (253,479)
Interest earned on investment held in Trust Account	588,076	726,071
Interest expense	(252,293)	0
Net (loss) income	(29,122)	472,592
Operating Segments [Member]
Professional services fee in connection with Business Combination	(109,150)	(142,800)
Other formation and operating costs	(255,755)	(110,679)
Total formation and operating costs	(364,905)	(253,479)
Interest earned on investment held in Trust Account	588,076	726,071
Interest expense	(252,293)	0
Net (loss) income	$ (29,122)	$ 472,592

Amount of interest expense classified as operating and nonoperating. Includes, but is not limited to, cost of borrowing accounted for as interest expense.

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+ Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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+ Details

Horizon Space Acquisition II Corp. 10-Q