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Income taxes (Tables) | 12 Months Ended
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Dec. 31, 2022
Income taxes |
Schedule of components of income before income taxes | The components of income before income taxes for the years ended December 31, 2022 and 2021 are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
​ |  | 2022 |  | 2021
Foreign (not subject to income taxes) | ​ | $ | 6,958,583 | ​ | $ | 5,780,692
Mexico | ​ |  | (987,279) | ​ |  | (1,767,915)
United States | ​ |  | 1,394,642 | ​ |  | (2,952,265)
​ | ​ |  | 7,365,946 | ​ |  | 1,060,512
Less discontinued operations | ​ |  | 2,371,049 | ​ |  | 2,574,079
​ | ​ | $ | 9,736,995 | ​ | $ | 3,634,591
​
Schedule of provision for income taxes deferred tax benefit relating to U.S. operations | The Company’s provision (benefit) for income taxes for the years ended December 31, 2022 and 2021, which related to U.S. operations, consists of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
​ |  | 2022 |  | 2021
Current: | ​ | ​ | ​ | ​ | ​ | ​
Federal | ​ | $ | 430,116 | ​ | $ | 202,444
State | ​ | ​ | (29,157) | ​ | ​ | (895)
Foreign | ​ | ​ | — | ​ | ​ | —
Total | ​ | ​ | 400,959 | ​ | ​ | 201,549
Deferred: | ​ |  | ​ | ​ |  | ​
Federal | ​ | ​ | (184,469) | ​ | ​ | (524,733)
State | ​ | ​ | 180,249 | ​ | ​ | (124,798)
Foreign | ​ | ​ | — | ​ | ​ | —
Total | ​ | ​ | (4,220) | ​ | ​ | (649,531)
Total provision (benefit) | ​ | $ | 396,739 | ​ | $ | (447,982)
​
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, 2022 and 2021 is as follows: ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, |
​ |  | 2022 |  | 2021 |
U.S. statutory federal rate | ​ | 21.00 | % | 21.00 | %
State taxes, net of federal effect |  | 8.88 | % | 2.72 | %
Nontaxable foreign income |  | (25.57) | % | (43.36) | %
Research & development tax credit |  | (1.92) | % | (7.39) | %
Permanent items |  | (0.70) | % | (6.26) | %
Goodwill impairment | ​ | — | % | 20.31 | %
Valuation allowance for deferred tax assets |  | 2.38 | % | 0.65 | %
​ |  | 4.07 | % | (12.33) | %
​
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, 2022 and 2021 were as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2022 |  | 2021
Continuing Operations | ​ | ​ | ​ | ​ | ​ | ​
Deferred tax assets: |  | ​ |  |  | ​ |
Research & development tax credits | ​ | $ | 58,069 | ​ | $ | 398,413
Loss carryforward | ​ | ​ | 443,076 | ​ | ​ | 300,545
Accrued compensation | ​ | ​ | 82,503 | ​ | ​ | 112,446
Operating lease liabilities | ​ | ​ | 412,840 | ​ | ​ | 469,398
Valuation allowances | ​ |  | (29,036) | ​ |  | (139,207)
​ | ​ |  | 967,452 | ​ |  | 1,141,595
Deferred tax liabilities: | ​ |  |  | ​ |  |
Property and equipment | ​ |  | 293,195 | ​ |  | 254,301
Intangible assets | ​ |  | 821,723 | ​ |  | 982,422
Operating lease right-of-use assets | ​ |  | 412,840 | ​ |  | 469,398
​ | ​ |  | 1,527,758 | ​ |  | 1,706,121
​ | ​ | ​ | ​ | ​ | ​ | ​
Net deferred tax liability | ​ | $ | 560,306 | ​ | $ | 564,526
​ | ​ | ​ | ​ | ​ | ​ | ​
Discontinued Operations | ​ | ​ | ​ | ​ | ​ | ​
Deferred tax assets: | ​ | ​ | ​ | ​ | ​ | ​
Operating loss carryforwards - Mexico | ​ | $ | 5,378,177 | ​ | $ | 4,230,398
Land basis difference - Mexico | ​ | ​ | 2,163,681 | ​ | ​ | 1,602,470
Start-up costs - Mexico | ​ | ​ | 4,274,858 | ​ | ​ | 4,693,395
Valuation allowances | ​ | ​ | (11,816,716) | ​ | ​ | (10,526,263)
​ | ​ | $ | — | ​ | $ | —
​

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32639-109319 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319 + Details
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