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Share Based Payments - Equity incentive plan - Non-vested share awards (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Mar. 26, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Number of shares reserved for issuance under the plan       2,000,000
Number of outstanding and exercisable options 2,800 2,800    
Options exercise price $ 4,560 $ 4,560    
Weighted average remaining contractual life of the options 10 months 21 days      
Unrecognized cost of unvested share-based compensation awards $ 321,826      
Remaining weighted average period of recognition for unrecognized cost of share-based compensation awards 1 year      
Share based compensation $ 966,915 $ 986,416 $ 805,469