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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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Bank deposits frozen

+ References

No definition available.

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- Definition

The value (monetary amount) of the award the plaintiff seeks in the legal matter.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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