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Accounting policies (Tables)

12 Months Ended

Dec. 31, 2012

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 operating lease term outstanding
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 years ended December 31, 2012 and 2011 are as follows:

		2012												2011
Method		Retail				Bulk				Services				Retail				Bulk				Services
Discounted cash flow			20	%			30	%							20	%			10	%			20	%
Subject company stock price			60	%			50	%			10	%			40	%			10	%			80	%
Guideline public company			10	%			10	%							20	%			40	%
Mergers and acquisitions			10	%			10	%							20	%			40	%
Net asset value											90	%
			100	%			100	%			100	%			100	%			100	%			100	%