Summary of significant accounting policies (Details)	6 Months Ended
	Apr. 30, 2026 USD ($) shares	Apr. 30, 2025 shares	Apr. 30, 2026 EUR (€)	Oct. 31, 2025 USD ($)
Summary of significant accounting policies [Abstract]
Producing gas and oil royalty rights, net of amortization | $	$ 1			$ 1
Cash held at bank	$ 40,425		€ 34,735
Number of units of beneficial interest outstanding (in Units) | shares	9,190,590	9,190,590