Significant accounting policies (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Significant Accounting Policies
Net (loss) /income	$ 149,028	$ 296,392	$ 296,369	$ 1,659,067
Accretion of carrying value to redemption value	(596,466)	(975,738)	(1,771,094)	(3,021,081)
Net loss including accretion of carrying value to redemption value	$ (447,438)	$ (679,346)	$ (1,474,725)	$ (1,362,014)