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Summary of significant accounting policies (Details Textual)	Dec. 31, 2016
SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Short-term Debt, Weighted Average Interest Rate	1.25%

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- References

No definition available.

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- Definition

Weighted average interest rate of short-term debt outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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