The amount of total capital as defined in the regulations.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6490092&loc=d3e47304-110998

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1H
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1H
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=6490092&loc=d3e47080-110998

Name:	us-gaap_Capital
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Commitments and contingencies (Details Textual) - Chongquing Venture Fund [Member] ¥ in Millions, $ in Millions	Sep. 30, 2017 USD ($)	Sep. 30, 2017 CNY (¥)	May 31, 2016 USD ($)	May 31, 2016 CNY (¥)
Commitments and Contingencies Disclosure [Line Items]
Unpaid Capital	$ 5.4	¥ 36.0
Hubei Henglong [Member]
Commitments and Contingencies Disclosure [Line Items]
Capital	$ 12.7	¥ 84.0	$ 18.1	¥ 120.0
Equity Method Investment, Ownership Percentage	35.00%	35.00%