Segment information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Segment information
Professional service fee in connection with the business combination	$ 0	$ (250,000)	$ (75,000)	$ (260,000)
Other formation and operating costs	(87,438)	(249,346)	(319,725)	(542,014)
Total formation and operating costs	(87,438)	(499,346)	(394,725)	(802,014)
Interest earned on investment held in trust account	236,466	795,738	691,094	2,461,081
Net income	$ 149,028	$ 296,392	$ 296,369	$ 1,659,067