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Stock-based compensation (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | May 14, 2008
Stock-based compensation |  |  |  |
Number of days employee option to purchase preferred stock must be exercised | 30 days |  |  |
Preferred stock value | $ 26,402 | $ 26,578 |  |
Number of stock grant rights issued | 7,204 |  |  |
Allocated share-based compensation expense, net | $ 142,566 | $ 703,289 | $ 386,260 |
Closing price of the common shares | $ 25.89 |  |  |
Number of shares outstanding, options, Nonvested | 13,475 |  |  |
Weighted average exercise price, Nonvested | $ 16.97 |  |  |
Average remaining contractual life, Nonvested | 1 year 6 months 4 days |  |  |
Total remaining unrecognized compensation costs | $ 32,423 |  |  |
Total remaining unrecognized compensation, weighted average period | 1 year 6 months 4 days |  |  |
Cumulative financial performance targets measurement period |  | 3 years |  |
Compensation expense relating to stock and stock option grants | $ 1,397,583 | $ 1,933,666 | $ 1,417,172 |
Non-performance-based |  |  |  |
Stock-based compensation |  |  |  |
Number of stock grant rights issued | 12,837 | 29,508 | 32,265 |
Vesting period | 3 years |  |  |
Number of vested shares issued | $ 29,392 | $ 25,986 | $ 23,411 |
Allocated share-based compensation expense | $ 412,520 | 366,058 | $ 325,270 |
Cumulative financial performance targets measurement period | 3 years |  |  |
Non Executive Directors Share Plan |  |  |  |
Stock-based compensation |  |  |  |
Number of stock grant rights issued |  |  | 30,767 |
Compensation expense relating to stock and stock option grants | $ 333,140 | $ 341,394 | $ 369,678 |
Performance-Based Grants |  |  |  |
Stock-based compensation |  |  |  |
Number of stock grant rights issued | 41,889 | 26,742 | 13,797 |
Cumulative financial performance targets measurement period | 3 years | 3 years | 3 years |
Compensation expense relating to stock and stock option grants | $ 509,357 | $ 522,925 | $ 335,964 |
Employee Stock Option | Common Stock Options |  |  |  |
Stock-based compensation |  |  |  |
Number of stock grant rights issued | 1,300 | 3,010 | 3,665 |
Equity Incentive Plan 2008 |  |  |  |
Stock-based compensation |  |  |  |
Common stock, capital shares reserved for future issuance |  |  |  | 1,500,000
Redeemable preferred stock |  |  |  |
Stock-based compensation |  |  |  |
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 |  |  |
Issuance of common stock for services rendered | 5,904 | 13,309 | 9,295 |
Redeemable preferred stock | Non Executive Directors Share Plan |  |  |  |
Stock-based compensation |  |  |  |
Number of stock grant rights issued | 11,448 | 22,831 |  |

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