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Restriction on retained earnings (Details Textual) (Retained Earnings, Appropriated [Member], USD $) In Millions, unless otherwise specified | Dec. 31, 2014
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Retained Earnings, Appropriated [Member] |
Retained Earnings Adjustments [Line Items] |
Retained Earnings (Accumulated Deficit) | $ 7.9 us-gaap_RetainedEarningsAccumulatedDeficit / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsAppropriatedMember

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- Definition The cumulative amount of the reporting entity's undistributed earnings or deficit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.31(a)(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_RetainedEarningsAccumulatedDeficit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_RetainedEarningsAdjustmentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration