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Concentration of risk (Details Narrative)	3 Months Ended		9 Months Ended
Concentration of risk (Details Narrative)	Jun. 30, 2026 USD ($)	Jun. 30, 2025	Jun. 30, 2026 USD ($)	Jun. 30, 2025	Jun. 30, 2026 HKD ($)	Dec. 31, 2025 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2025 HKD ($)
Concentration Risk [Line Items]
Cash	$ 26,185,827		$ 26,185,827				$ 10,130,942
Cash uninsured limit	520,197		520,197			$ 8,806,910
Accounts receivable	935,666		935,666
Accounts payable
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Three Customers [Member]
Concentration Risk [Line Items]
Concentration risk percentage	95.00%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Four Customers [Member]
Concentration Risk [Line Items]
Concentration risk percentage			98.00%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Two Customers [Member]
Concentration Risk [Line Items]
Concentration risk percentage		100.00%		76.00%
Supplier Concentration Risk [Member] \| Cost of Goods and Service Benchmark [Member] \| Three Suppliers [Member]
Concentration Risk [Line Items]
Concentration risk percentage	82.00%	100.00%	83.00%	100.00%
Hong Kong Deposit Protection Board [Member]
Concentration Risk [Line Items]
Cash insured limit					$ 800,000			$ 800,000
Cash uninsured limit					$ 24,391,312			$ 429,580
Maximum [Member]
Concentration Risk [Line Items]
Cash insured limit	$ 250,000		$ 250,000