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Share-based compensation plans (Details) (USD $)
3 Months Ended
Mar. 31, 2014
item
Mar. 31, 2013
Share-based compensation plans    
Number of plans 2  
SARs
   
Share-based compensation plans    
Number of shares awarded 235,000  
Vesting period 3 years  
Number of annual payments 3  
Vesting percentage 33.00%  
Share-based compensation expense $ 86,512 $ 0
Unrecognized compensation cost related to unvested share-based compensation $ 1,007,928  
Period of recognizing unrecognized compensation cost related to unvested share-based compensation 3 years