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Accounting policies (Tables)
 12 Months Ended
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
%