Fair value measurements (Details 1) (USD $)	9 Months Ended
	Sep. 30, 2014
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Balance, Beginning	$ 6,623,448
Profit sharing and equity from earnings of OC-BVI	302,809
Distributions received from OC-BVI	(969,600)
Balance, Ending	$ 5,956,657