Taxes - Schedule of effective tax rate (Details)	12 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Taxes
China income tax rate	25.00%	25.00%	25.00%
Change in valuation allowance	1.20%	0.00%	1.30%
Income tax exemption status granted	(21.50%)	(9.30%)	0.00%
Others	0.00%	0.20%	0.00%
Effective tax rate	4.70%	15.90%	26.30%

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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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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