Annual report pursuant to Section 13 and 15(d)

Stock Option Plan (Details 1)

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Stock Option Plan (Details 1) - Employee Stock Option [Member] - $ / shares
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding at January 1 1,368,047 485,573  
Stock Options, Granted 221,102 899,526  
Stock Options, Exercised (201,389) (10,500)  
Stock Options, Forfeited/Expired/Exchanged (55,437) (6,552)  
Outstanding at December 31 1,332,323 1,368,047 485,573
Stock Options, Exercisable at December 31 572,623 467,204  
Outstanding at January 1 $ 6.41 $ 4.24  
Weighted Average Exercise Price, Granted (in dollars per share) 7.80 7.49  
Weighted Average Exercise Price, Exercised (in dollars per share) 4.47 0.10  
Weighted Average Exercise Price, Forfeited/Expired/Exchanged (in dollars per share) 6.13 4.53  
Outstanding at December 31 6.94 6.41 $ 4.24
Weighted Average Exercise Price, Exercisable at December 31 (in dollars per share) $ 6.02 $ 4.65  
Weighted Average Remaining Life, Outstanding (in years) 8 years 4 months 24 days 8 years 8 months 12 days 8 years 2 months 12 days
Weighted Average Remaining Life, Exercisable at December 31 (in years) 7 years 9 months 18 days 7 years 3 months 18 days