Future Minimum rental receivable (Details) - ZHEJIANG JIAHUAN - CNY (¥) ¥ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Within 1 year	¥ 859	¥ 791
After 1 year but within 5 years	447	0
Total	¥ 1,306	¥ 791

Future rental payments receivable within one year of the balance sheet date under an operating lease.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84164653&loc=d3e41551-112718

Name:	us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant