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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 |

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