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Summary of significant accounting policies - Foreign currency translation and transaction (Details)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2017
Summary of significant accounting policies
Translation adjustments included in accumulated other comprehensive loss	$ (308,571)	$ (41,025)
Historical rate	6.87	6.62
Average translation rate	6.83	6.51	6.81

Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.

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