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Stock-based compensation (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
May 14, 2008
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Cumulative financial performance targets measurement period   3 years  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 8,223    
Allocated Share-based Compensation Expense, Net of Tax $ 125,487 $ 142,632  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares 10,030    
Share-based Compensation Arrangement by Share-based Payment Award, Option, Nonvested, Weighted Average Exercise Price $ 12.98    
Share Based Compensation Arrangement By Share Based Payment Award Options Non Vested Outstanding Weighted Average Remaining Contractual Term 2 years 25 days    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 2 years 25 days    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 14,427    
Preferred stock value $ 18,641 20,251  
Number of days employee option to purchase preferred stock must be exercised 30 days    
Share-based Compensation $ 1,163,261 $ 1,192,224  
Closing Price of Common Shares $ 12.05    
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 19,712 22,034  
Share-based Compensation $ 318,991 $ 322,036  
Non-Performance-Based Grants [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years    
Cumulative financial performance targets measurement period 3 years    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 25,789 28,891  
Allocated Share-based Compensation Expense $ 344,940 $ 337,032  
Performance-Based Grants [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Cumulative financial performance targets measurement period 3 years 3 years  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 31,788 36,007  
Allocated Share-based Compensation Expense $ 373,843 $ 390,524  
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 2,100 2,575  
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 Non Vested Outstanding Weighted Average Remaining Contractual Term 1 year 1 month 24 days    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 142,328    
Preferred stock value $ 0    
Additional consecutive individual requisite service period required for eligibility in Employee Share Incentive Plan 4 years    
Number of preferred shares converted to common shares dependent upon specific criteria 1    
Number of common shares received upon conversion of preferred shares dependent upon specific criteria 1    
Number of average trading price of the common stock 7 days    
Stock Issued During Period, Shares, Issued for Services 6,123 7,293