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Fair value measurements (Details 1) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Investment in OC-BVI        
Impairment loss on investment in OC-BVI $ (875,000) $ (225,000) $ (925,000) $ (810,000)
Net liability arising from put/call options        
Balance as of September 30, 2016 658,000   658,000  
Fair Value, Inputs, Level 3 [Member]        
Investment in OC-BVI        
Balance as of December 31, 2015     4,548,271  
Profit sharing and equity from earnings of OC-BVI     319,598  
Distributions received from OC-BVI     0  
Impairment loss on investment in OC-BVI     (925,000)  
Balance as of September 30, 2016 3,942,869   3,942,869  
Net liability arising from put/call options        
Balance as of December 31, 2015 [1]     0  
Issuance [1]     383,000  
Unrealized loss [1]     275,000  
Balance as of September 30, 2016 [1] $ 658,000   $ 658,000  
[1] The net liability arising from the put/call options is included other liabilities in the accompanying condensed consolidated balance sheets as of September 30, 2016.