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Income taxes (Tables) | 12 Months Ended
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Dec. 31, 2023
Income taxes |
Schedule of components of income before income taxes | The components of income before income taxes for the years ended December 31, 2023 and 2022 are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
​ |  | 2023 |  | 2022
Foreign (not subject to income taxes) | ​ | $ | 10,002,233 | ​ | $ | 6,958,583
Mexico | ​ |  | (742,367) | ​ |  | (987,279)
United States | ​ |  | 27,649,330 | ​ |  | 1,394,642
​ | ​ |  | 36,909,196 | ​ |  | 7,365,946
Discontinued operations | ​ |  | 1,086,744 | ​ |  | 2,371,049
​ | ​ | $ | 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, 2023 and 2022, which related to U.S. operations, consisted of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
​ |  | 2023 |  | 2022
Current: | ​ | ​ | ​ | ​ | ​ | ​
Federal | ​ | $ | 5,611,360 | ​ | $ | 430,116
State | ​ | ​ | 1,663,653 | ​ | ​ | (29,157)
Foreign | ​ | ​ | — | ​ | ​ | —
Total current income tax expense (benefit) | ​ | ​ | 7,275,013 | ​ | ​ | 400,959
Deferred: | ​ |  | ​ | ​ |  | ​
Federal | ​ | ​ | (276,070) | ​ | ​ | (184,469)
State | ​ | ​ | (248,929) | ​ | ​ | 180,249
Foreign | ​ | ​ | — | ​ | ​ | —
Total deferred income tax expense (benefit) | ​ | ​ | (524,999) | ​ | ​ | (4,220)
Total provision for (benefit from) income taxes | ​ | $ | 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, 2023 and 2022 is as follows: ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, |
​ |  | 2023 |  | 2022 |
U.S. statutory federal rate | ​ | 21.00 | % | 21.00 | %
State taxes, net of federal effect |  | 2.88 | % | 8.88 | %
Foreign rate differential |  | (5.71) | % | (25.57) | %
Research and development tax credit |  | — | % | (1.92) | %
Permanent items |  | (0.32) | % | (0.70) | %
Change in valuation allowance |  | (0.08) | % | 2.38 | %
​ |  | 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, 2023 and 2022 were as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2023 |  | 2022
Continuing Operations | ​ | ​ | ​ | ​ | ​ | ​
Deferred tax assets: |  | ​ |  |  | ​ |
Research and development credit carryforwards | ​ | $ | — | ​ | $ | 58,069
Net operating loss carryforwards | ​ | ​ | 130,911 | ​ | ​ | 443,076
Accruals and reserves | ​ | ​ | 146,057 | ​ | ​ | 82,503
Operating lease liabilities | ​ | ​ | 501,397 | ​ | ​ | 412,840
Capitalized research expenditures | ​ | ​ | 326,178 | ​ | ​ | —
Others | ​ | ​ | 29,094 | ​ | ​ | —
Valuation allowances | ​ |  | — | ​ |  | (29,036)
​ | ​ |  | 1,133,637 | ​ |  | 967,452
Deferred tax liabilities: | ​ |  |  | ​ |  |
Property and equipment | ​ |  | 325,473 | ​ |  | 293,195
Intangible assets | ​ |  | 847,450 | ​ |  | 821,723
Operating lease right-of-use assets | ​ |  | 491,494 | ​ |  | 412,840
​ | ​ |  | 1,664,417 | ​ |  | 1,527,758
​ | ​ | ​ | ​ | ​ | ​ | ​
Net deferred tax liabilities | ​ | $ | (530,780) | ​ | $ | (560,306)
​ | ​ | ​ | ​ | ​ | ​ | ​
Discontinued Operations | ​ | ​ | ​ | ​ | ​ | ​
Deferred tax assets: | ​ | ​ | ​ | ​ | ​ | ​
Operating loss carryforwards - Mexico | ​ | $ | 5,844,847 | ​ | $ | 5,378,177
Land basis difference - Mexico | ​ | ​ | 2,818,663 | ​ | ​ | 2,163,681
Start-up costs - Mexico | ​ | ​ | 7,015,484 | ​ | ​ | 4,274,858
Valuation allowances | ​ | ​ | (15,678,994) | ​ | ​ | (11,816,716)
​ | ​ | $ | — | ​ | $ | —

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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://fasb.org/us-gaap/role/ref/legacyRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-2 + Details
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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Paragraph 12 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-12 + Details
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