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Financial instruments (Details 1) (USD $)			12 Months Ended
Financial instruments (Details 1) (USD $)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Fair Value, Inputs, Level 3 [Member]
Balance	$ 6,925,346	$ 6,634,598	$ 6,634,598
Profit sharing and equity from earnings of OC-BVI			2,464,773
Distribution of earnings from OC-BVI			(2,174,025)
Balance	$ 6,925,346	$ 6,634,598	$ 6,925,346

This item represents disclosure of the amount of dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporation; these investments are accounted for under the equity method of accounting. This element excludes distributions that constitute a return of investment, which are classified as investing activities.

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