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Summary of significant accounting policies (Tables)
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Mar. 31, 2015
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| Accounting Policies [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule Of Property, Plant And Equipment Estimated Useful Lives [Table Text Block] | Depreciation is computed on a straight-line basis, based on the following estimated useful lives:
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| Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] | The following table sets forth the computation of the basic and diluted earnings per share for the three-month periods ended March 31, 2015 and 2014:
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