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Stock-based compensation (Details Textual) (USD $)
12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Common Stock Options [Member]
Dec. 31, 2011
Common Stock Options [Member]
Dec. 31, 2010
Common Stock Options [Member]
Dec. 31, 2012
Non Executive Directors Share Plan [Member]
Dec. 31, 2011
Non Executive Directors Share Plan [Member]
Dec. 31, 2010
Non Executive Directors Share Plan [Member]
Dec. 31, 2012
Redeemable Preferred Stock [Member]
Dec. 31, 2011
Redeemable Preferred Stock [Member]
Dec. 31, 2010
Redeemable Preferred Stock [Member]
Dec. 31, 2012
Stock Option [Member]
Redeemable Preferred Stock [Member]
Dec. 31, 2011
Stock Option [Member]
Redeemable Preferred Stock [Member]
Dec. 31, 2010
Stock Option [Member]
Redeemable Preferred Stock [Member]
Jul. 31, 2011
Equity Incentive Plan2008 [Member]
Feb. 28, 2011
Equity Incentive Plan2008 [Member]
Dec. 31, 2012
Equity Incentive Plan2008 [Member]
Dec. 31, 2009
Equity Incentive Plan2008 [Member]
Dec. 31, 2012
2001 Employee Share Option Plan [Member]
Dec. 31, 2011
2001 Employee Share Option Plan [Member]
Dec. 31, 2010
2001 Employee Share Option Plan [Member]
Allocated Share-based Compensation Expense $ 371,038 $ 494,648 $ 257,799       $ 82,649 $ 71,945 $ 47,203                          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 15,813                             18,000 143,612   101,697      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate 0.26% 1.33% 0.54%                                      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term 1 year 6 months 3 years 4 months 24 days 1 year 7 months 6 days                                      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Weighted Average Volatility Rate                                 10.68%          
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Weighted Average Expected Dividend 3.78% 2.89% 2.49%                         9.11%            
Sale Of Stock, Price Per Share $ 7.40                                 $ 9.11   $ 10.68    
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Non Vested, Outstanding, Number 116,354                                          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number 199,300                                          
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Non Vested, Outstanding, Weighted Average Exercise Price $ 10.51                                          
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Vested and Expected To Vest, Outstanding, Weighted Average Exercise Price $ 15.34                                   $ 7.90      
Share Based Compensation Arrangement By Share Based Payment Award Options Non Vested Outstanding Weighted Average Remaining Contractual Term 3 years 5 months 23 days                                          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term 1 year 2 months 27 days                                          
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized $ 152,975                 $ 108,126                        
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition                   1 year 2 months 9 days                        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross       5,780 5,440 3,165       10,033 7,455 5,379 10,033 7,455 5,379         5,780 5,440 3,165
Issue of share capital (in shares)             10,886 7,614 3,471                          
Stock Reserved For Future Issuance                                   1,500,000