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Concentration of risk (Details) | 12 Months Ended
--- | ---
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% |  |

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