Quarterly report pursuant to Section 13 or 15(d)

Stock options and warrants (Schedule of Nonvested Awards) (Details)

v3.4.0.3
Stock options and warrants (Schedule of Nonvested Awards) (Details) - Stock Incentive Plan [Member] - $ / shares
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Nonvested Shares Underlying Options    
Beginning balance 33,336  
Granted
Vested (9,803)  
Forfeited (3,620) (19,792)
Ending balance 19,913  
Weighted Average Exercise Price    
Beginning balance $ 15.54  
Granted  
Vested $ 16.67  
Forfeited 15.13 $ 16.48
Ending balance 15.06  
Weighted Average Grant Date Fair Value    
Beginning balance $ 11.41  
Granted  
Vested $ 12.92  
Forfeited 10.75  
Ending balance $ 10.79