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Stock options (Details Textual) (USD $)
 12 Months Ended
Dec. 31, 2012
Share-Based Compensation Arrangement By Share-Based Payment Award, Number Of Shares Authorized 2,270,118
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Vested In Period, Fair Value $ 300,000
Employee Service Share-Based Compensation, Nonvested Awards, Total Compensation Cost Not Yet Recognized 1,100,000
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Exercises In Period, Total Intrinsic Value 500,000
Stock Issued During Period Shares Stock Options Exercised 231,772
Chief Executive Officer [Member]
  
Stock Issued During Period Shares Stock Options Exercised 44,000
Stock Issued During Period Value Stock Options Exercised1 113,960
Common Stock Shares Surrendered During Period 20,758
Common Stock Additional Shares Surrendered During Period. 8,936
Payments Related To Tax Withholding For Share-Based Compensation $ 49,062
Stock Issued During Period, Shares, Share-Based Compensation, Net Of Forfeitures 14,306
Stock Appreciation Rights (Sars) [Member]
  
Share-Based Compensation Arrangement By Share-Based Payment Award, Plan Modification, Description and Terms The maximum number of shares of common stock that may be delivered under the 2009 Plan is 2,270,118 shares, less one share for every share that becomes subject to an Option or Stock Appreciation Rights (SAR) granted after March 31, 2012
Stock Options [Member]
  
Share-Based Compensation Arrangement By Share-Based Payment Award, Plan Modification, Description and Terms two shares for every share that becomes subject to an Award other than an Option or SAR granted after March 31, 2012.