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Stock-based compensation (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
May 14, 2008
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 9,868    
Allocated Share-based Compensation Expense, Net of Tax $ 142,632 $ 137,191  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares 10,650    
Share-based Compensation Arrangement by Share-based Payment Award, Option, Nonvested, Weighted Average Exercise Price $ 13.08    
Share Based Compensation Arrangement By Share Based Payment Award Options Non Vested Outstanding Weighted Average Remaining Contractual Term 2 years 15 days    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 2 years 15 days    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 16,715    
Preferred stock value 20,251 20,878  
Share-based Compensation $ 1,192,224 $ 850,136  
Closing Price of Common Shares $ 16.30    
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 22,034 18,242  
Share-based Compensation $ 322,036 $ 236,691  
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 28,891 26,864  
Allocated Share-based Compensation Expense $ 337,032 $ 317,991  
Performance-Based Grants [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 35,993 10,574  
Allocated Share-based Compensation Expense $ 390,524 $ 158,263  
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 2,575 2,750  
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 $ 153,481    
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 dependant 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    
Number of days employee option to purchase preferred stock must be exercised 30 days    
Stock Issued During Period, Shares, Issued for Services 7,293 7,409