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Accounting policies (Tables) | 12 Months Ended
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Dec. 31, 2014
Accounting Policies [Abstract] |
Schedule Of Property Plant And Equipment Useful Life [Table Text Block] | Rates are determined based on the estimated useful lives of the assets as follows:
Buildings | 5 to 40 years
Plant and equipment | 4 to 40 years
Distribution system | 3 to 40 years
Office furniture, fixtures and equipment | 3 to 10 years
Vehicles | 3 to 10 years
Leasehold improvements | Shorter of 5 years or lease term
Lab equipment | 5 to 10 years
Estimated Fair value Of Reporting Segment [Table Text Block] | The respective weightings the Company applied to each method for the year ended December 31, 2014 were consistent with those used for the year ended December 31, 2013 and are as follows:
|  | 2014 |  |  | 2013 |
Method |  | Retail |  | Bulk |  |  | Retail |  | Bulk |
Discounted cash flow |  | 50 | % | 50 | % |  | 50 | % | 50 | %
Subject company stock price |  | 30 | % | 30 | % |  | 30 | % | 30 | %
Guideline public company |  | 10 | % | 10 | % |  | 10 | % | 10 | %
Mergers and acquisitions |  | 10 | % | 10 | % |  | 10 | % | 10 | %
|  | 100 | % | 100 | % |  | 100 | % | 100 | %

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- Definition Disclosure of accounting policy for schedule of property plant and equipment useful life. + References No definition available. + Details
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