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Stock-based compensation (Details) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
May 14, 2008
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Cumulative financial performance targets measurement period   3 years  
Number of stock grant rights issued 12,032    
Allocated Share-based Compensation Expense, Net of Tax $ 137,215 $ 125,487  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares 10,490    
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 3 months 18 days    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 2 years 3 months 18 days    
Preferred stock value $ 17,181 18,641  
Number of days employee option to purchase preferred stock must be exercised 30 days    
Share-based Compensation $ 977,232 $ 1,163,261  
Closing Price of Common Shares $ 10.64    
Non Executive Directors Share Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of stock grant rights issued 30,911 19,712  
Share-based Compensation $ 319,002 $ 318,991  
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    
Number of stock grant rights issued 26,403 23,458  
Number of vested shares issued $ 25,789 $ 28,891  
Allocated Share-based Compensation Expense $ 306,250 $ 344,940  
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  
Number of stock grant rights issued 18,419 31,788  
Allocated Share-based Compensation Expense $ 214,765 $ 373,843  
Employee Stock Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 16,554    
Employee Stock Option [Member] | Common Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of stock grant rights issued 3,400 2,100  
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 2 months 1 day    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 147,074    
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 8,632 6,123