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Current and future income taxes (Details Textual)
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12 Months Ended | ||
|---|---|---|---|
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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| Statement Of Current And Deferred Income Taxes [Line Items] | |||
| Statutory income tax rate | 34.00% | 13.50% | 13.50% |