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Stock-based compensation (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | 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 | 12,960 |  |
Allocated Share-based Compensation Expense, Net of Tax | $ 386,260 | $ 137,215 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares | 11,740 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Option, Nonvested, Weighted Average Exercise Price | $ 13.59 |  |
Share Based Compensation Arrangement By Share Based Payment Award Options Non Vested Outstanding Weighted Average Remaining Contractual Term | 2 years 4 months 13 days |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition | 2 years 4 months 13 days |  |
Preferred stock value | $ 20,630 | 17,181 |
Number of days employee option to purchase preferred stock must be exercised | 30 days |  |
Share-based Compensation | $ 1,417,172 | $ 977,232 |
Closing Price of Common Shares | $ 14.80 |  |
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 |
Share-based Compensation | $ 369,678 | $ 319,002 |
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 | 32,265 | 26,403 |
Number of vested shares issued | $ 23,411 | $ 25,789 |
Allocated Share-based Compensation Expense | $ 325,270 | $ 306,250 |
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 | 13,797 | 18,419 |
Share-based Compensation | $ 335,964 | $ 214,675 |
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 | $ 23,609 |  |
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 | 3,665 | 3,400 |
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] |  |  |
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 | 9,295 | 8,632 |
Redeemable preferred stock [Member] | Non Executive Directors Share Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of stock grant rights issued | 30,767 |  |

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