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Fair value measurements (Details 1) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Balance as of December 31, 2011     $ 6,634,598  
Equity in earnings of OC-BVI 99,932 159,250 201,693 791,722
Distribution of earnings from OC-BVI     507,525 202,631
Balance as of September 30, 2012 6,442,391   6,442,391  
Fair Value, Inputs, Level 3 [Member]
       
Balance as of December 31, 2011     6,634,598  
Equity in earnings of OC-BVI     201,693  
Distribution of earnings from OC-BVI     (393,900)  
Balance as of September 30, 2012 $ 6,442,391   $ 6,442,391