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Stock Options (Details 2) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Stock options
2003 Plan
Dec. 31, 2012
Stock options
2003 Plan
Stock options activity        
Outstanding at the beginning of the period (in shares)     1,448,200  
Exercised (in shares) (317,600) (468,000) (478,800)  
Forfeited (in shares)     (65,000)  
Outstanding at the end of the period (in shares)     904,400  
Vested and expected to vest at the end of the period (in shares)     841,520  
Exercisable at the end of the period (in shares)     520,900  
Weighted Average Exercise Price        
Outstanding at the beginning of the period (in dollars per share)     $ 2.02  
Exercised (in dollars per share) $ 1.60 $ 1.60 $ 1.79  
Forfeited (in dollars per share)     $ 2.15  
Outstanding at the end of the period (in dollars per share)     $ 2.14  
Vested and expected to vest at the end of the period (in dollars per share)     $ 2.12  
Exercisable at the end of the period (in dollars per share)     $ 1.96  
Aggregate Intrinsic Value        
Outstanding at the end of the period     $ 3,603,712 $ 1,617,138
Vested and expected to vest at the end of the period (in dollars)     3,367,912  
Exercisable at the end of the period     $ 2,165,587