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Pledged deposits (Narrative) (Details) - Shenzhen Huijie - July 7, 2016 [Member] | Jul. 07, 2016 USD ($) | Jul. 07, 2016 CNY (¥) | Sep. 01, 2017 USD ($) | Sep. 01, 2017 CNY (¥) | Sep. 07, 2016 USD ($) | Sep. 07, 2016 CNY (¥)
--- | --- | --- | --- | --- | --- | ---
Loss Contingency, Damages Sought, Value | $ 1,227,583 | ¥ 8,430,792 |  |  |  |
Bank deposits frozen |  |  | $ 1,227,583 | ¥ 8,430,792 | $ 1,227,583 | ¥ 8,430,792
Construction costs [Member] |  |  |  |  |  |
Loss Contingency, Damages Sought, Value | 900,000 | 6,100,000 |  |  |  |
Interest [Member] |  |  |  |  |  |
Loss Contingency, Damages Sought, Value | 29,812 | 200,000 |  |  |  |
Compensation [Member] |  |  |  |  |  |
Loss Contingency, Damages Sought, Value | $ 300,000 | ¥ 1,900,000 |  |  |  |

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