Summary of significant accounting policies (Details)	3 Months Ended		9 Months Ended
	Jul. 31, 2026 USD ($) shares	Jul. 31, 2025 shares	Jul. 31, 2026 USD ($) shares	Jul. 31, 2025 shares	Jul. 31, 2026 EUR (€)	Oct. 31, 2025 USD ($)
Summary of significant accounting policies [Abstract]
Producing gas and oil royalty rights, net of amortization | $	$ 1		$ 1			$ 1
Cash held at bank	$ 16,734		$ 16,734		€ 14,522
Number of units of beneficial interest outstanding (in Units) | shares	9,190,590	9,190,590	9,190,590	9,190,590