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Stock-based compensation (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
May. 14, 2008
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated Share-based Compensation Expense, Net of Tax $ 143,951 $ 116,574 $ 246,473  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price $ 10.46      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares 19,400      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number 75,078      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value $ 10.74      
Share Based Compensation Arrangement By Share Based Payment Award Options Non Vested Outstanding Weighted Average Remaining Contractual Term 1 year 10 months 13 days      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term 10 months 10 days      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 1 year 10 months 13 days      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 28,012      
Share-based Compensation $ 407,668 $ 202,454 $ 381,976  
Non Executive Directors Share Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 10,514 5,992 13,980  
Share-based Compensation $ 143,218 $ 85,880 $ 135,503  
Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated Share-based Compensation Expense $ 120,500      
Employee Stock Option [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 12,645      
Employee Stock Option [Member] | Common Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 4,030 2,990 6,600  
Equity Incentive Plan2008 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common Stock, Capital Shares Reserved for Future Issuance       1,500,000
Redeemable Preferred Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
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 8 days      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 143,234      
Stock Issued During Period, Shares, Issued for Services 8,615 5,957 10,180  
Redeemable Preferred Stock [Member] | Employee Share Option Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock Issued During Period, Shares, Issued for Services 8,615 5,957 10,180