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The Amount of capital of a business which is used in its day-to-day trading operations, calculated as the current assets minus the current liabilities.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Concentration of risk (Details)	12 Months Ended
Concentration of risk (Details)	Jun. 30, 2019 USD ($) item	Jun. 30, 2018 USD ($) item	Jun. 30, 2017 item customer
Concentration Risk [Line Items]
Working capital	$ 22,900,000
Accounts Receivable, after Allowance for Credit Loss, Current	39,522,737	$ 24,364,119
PRC
Concentration Risk [Line Items]
Concentration Risk Deposits With Financial Institutions	$ 78,918	$ 319,071
Customer Concentration Risk [Member] \| Revenue from Contract with Customer, Product and Service Benchmark [Member]
Concentration Risk [Line Items]
Number of Major Customers \| customer			1
Customer Concentration Risk [Member] \| Maximum \| Revenue from Contract with Customer, Product and Service Benchmark [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	10.00%	10.00%
Customer Concentration Risk [Member] \| Major Customer One [Member] \| Revenue from Contract with Customer, Product and Service Benchmark [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage			79.10%
Customer Concentration Risk [Member] \| Major Customer One [Member] \| Accounts Receivable [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	10.00%	10.00%
Supplier Concentration Risk [Member] \| Cost of Goods and Service Benchmark [Member]
Concentration Risk [Line Items]
Number of Major Suppliers \| item	4	4	3
Supplier Concentration Risk [Member] \| Accounts Payable [Member]
Concentration Risk [Line Items]
Number of Major Suppliers \| item	4	2
Supplier Concentration Risk [Member] \| Vendor One [Member] \| Cost of Goods and Service Benchmark [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	29.80%	29.00%	51.30%
Supplier Concentration Risk [Member] \| Vendor One [Member] \| Accounts Payable [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	25.30%	47.50%
Supplier Concentration Risk [Member] \| Vendor Two [Member] \| Cost of Goods and Service Benchmark [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	17.60%	24.50%	22.20%
Supplier Concentration Risk [Member] \| Vendor Two [Member] \| Accounts Payable [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	23.00%	22.30%
Supplier Concentration Risk [Member] \| Vendor Three [Member] \| Cost of Goods and Service Benchmark [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	16.80%	21.20%	13.30%
Supplier Concentration Risk [Member] \| Vendor Three [Member] \| Accounts Payable [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	16.00%
Supplier Concentration Risk [Member] \| Vendor Four [Member] \| Cost of Goods and Service Benchmark [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	16.50%	12.80%
Supplier Concentration Risk [Member] \| Vendor Four [Member] \| Accounts Payable [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	12.30%