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Income taxes (Tables) | 12 Months Ended
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Dec. 31, 2024
Income taxes |
Schedule of components of income before income taxes | The components of income before income taxes for the years ended December 31, 2024, 2023, and 2022 are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
​ |  | 2024 |  | 2023 |  | 2022
Foreign (not subject to income taxes) | ​ | $ | 10,699,269 | ​ | $ | 10,002,233 | ​ | $ | 6,958,583
Mexico | ​ |  | 10,922,374 | ​ |  | (742,367) | ​ |  | (987,279)
United States | ​ |  | 9,412,015 | ​ |  | 27,649,330 | ​ |  | 1,394,642
​ | ​ |  | 31,033,658 | ​ |  | 36,909,196 | ​ |  | 7,365,946
Discontinued operations | ​ |  | (10,355,184) | ​ |  | 1,086,744 | ​ |  | 2,371,049
​ | ​ | $ | 20,678,474 | ​ | $ | 37,995,940 | ​ | $ | 9,736,995
​
Schedule of provision for income taxes deferred tax benefit relating to U.S. operations | The Company’s provision for (benefit from) income taxes for the years ended December 31, 2024, 2023, and 2022, which related to U.S. operations, consisted of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
​ |  | 2024 |  | 2023 |  | 2022
Current: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Federal | ​ | $ | 2,282,566 | ​ | $ | 5,611,360 | ​ | $ | 430,116
State | ​ | ​ | 255,835 | ​ | ​ | 1,663,653 | ​ | ​ | (29,157)
Foreign | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Total current income tax expense (benefit) | ​ | ​ | 2,538,401 | ​ | ​ | 7,275,013 | ​ | ​ | 400,959
Deferred: | ​ |  | ​ | ​ |  | ​ | ​ |  | ​
Federal | ​ | ​ | (267,100) | ​ | ​ | (276,070) | ​ | ​ | (184,469)
State | ​ | ​ | (52,787) | ​ | ​ | (248,929) | ​ | ​ | 180,249
Foreign | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Total deferred income tax expense (benefit) | ​ | ​ | (319,887) | ​ | ​ | (524,999) | ​ | ​ | (4,220)
Total provision for (benefit from) income taxes | ​ | $ | 2,218,514 | ​ | $ | 6,750,014 | ​ | $ | 396,739
​
Schedule of reconciliation of federal tax rate to the effective rate | A reconciliation of the U.S. statutory federal tax rate to the effective rate for the years ended December 31, 2024, 2023, and 2022 is as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, |
​ |  | 2024 |  | 2023 |  | 2023 |
U.S. statutory federal rate | ​ | 21.00 | % | 21.00 | % | 21.00 | %
State taxes, net of federal effect |  | 0.72 | % | 2.88 | % | 8.88 | %
Foreign rate differential |  | (11.45) | % | (5.71) | % | (25.57) | %
Research and development tax credit |  | — | % | — | % | (1.92) | %
Permanent items |  | 0.46 | % | (0.32) | % | (0.70) | %
Change in valuation allowance |  | — | % | (0.08) | % | 2.38 | %
​ |  | 10.73 | % | 17.77 | % | 4.07 | %
​
Schedule of tax effects of significant items net long-term deferred tax assets liability | The tax effects of significant items comprising the Company’s net long-term deferred tax liability as of December 31, 2024 and 2023 were as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2024 |  | 2023
Continuing Operations | ​ | ​ | ​ | ​ | ​ | ​
Deferred tax assets: |  | ​ |  |  | ​ |
Net operating loss carryforwards | ​ | $ | 80,285 | ​ | $ | 130,911
Accruals and reserves | ​ | ​ | 209,549 | ​ | ​ | 146,057
Operating lease liabilities | ​ | ​ | 425,797 | ​ | ​ | 501,397
Capitalized research expenditures | ​ | ​ | 316,937 | ​ | ​ | 326,178
Others | ​ | ​ | 88,750 | ​ | ​ | 29,094
Valuation allowances | ​ |  | — | ​ |  | —
​ | ​ |  | 1,121,318 | ​ |  | 1,133,637
Deferred tax liabilities: | ​ |  |  | ​ |  |
Property and equipment | ​ |  | 239,830 | ​ |  | 325,473
Intangible assets | ​ |  | 672,973 | ​ |  | 847,450
Operating lease right-of-use assets | ​ |  | 419,408 | ​ |  | 491,494
​ | ​ |  | 1,332,211 | ​ |  | 1,664,417
​ | ​ | ​ | ​ | ​ | ​ | ​
Net deferred tax liabilities | ​ | $ | (210,893) | ​ | $ | (530,780)
​ | ​ | ​ | ​ | ​ | ​ | ​
Discontinued Operations | ​ | ​ | ​ | ​ | ​ | ​
Deferred tax assets: | ​ | ​ | ​ | ​ | ​ | ​
Operating loss carryforwards - Mexico | ​ | $ | — | ​ | $ | 5,844,847
Land basis difference - Mexico | ​ | ​ | — | ​ | ​ | 2,818,663
Start-up costs - Mexico | ​ | ​ | — | ​ | ​ | 7,015,484
Valuation allowances | ​ | ​ | — | ​ | ​ | (15,678,994)
​ | ​ | $ | — | ​ | $ | —

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-9 + Details
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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-2 + Details
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