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Income taxes (Details Narrative)		12 Months Ended
	Dec. 22, 2017	Dec. 31, 2022
U.S. corporate tax rate	35.00%	21.00%
Income tax description		As the Company has a September 30 fiscal year-end, the lower corporate income tax rate will be phased in, resulting in a U.S. statutory federal rate of approximately 24.5% for our fiscal year ending September 30, 2018, and 21% for subsequent fiscal years. Accordingly, we have to remeasure our deferred tax assets on net operating loss carryforward in the U.S. at the lower enacted cooperated tax rate of 21%.
Percentage of deferred tax assets, valuation allowance		100.00%
Future foreign earnings		The change in rate has caused us to remeasure all U.S. deferred income tax assets and liabilities for temporary differences and net operating loss (NOL) carryforwards and recorded a one-time income tax payable in 8 years.
HONG KONG
Effective income tax rate reconciliation foreign income tax rate differential		16.50%
CHINA
Effective income tax rate reconciliation foreign income tax rate differential		25.00%

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to statutory income tax expense (benefit) outside of the country of domicile.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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A brief description of status of the tax examination, significant findings to date, and the entity's position with respect to the findings.

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