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Summary of significant accounting policies (Tables)
6 Months Ended
Jun. 30, 2014
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:
   
Buildings
20 years
 
Machinery and equipment
10 years
 
Furniture and fixtures
10 years
 
Office equipment and software
5 years