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Income taxes | 12 Months Ended
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Dec. 31, 2022
Income taxes |
Income taxes | 11. 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
​ 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)
​ 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) | %
​ 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)
​ | ​ | $ | — | ​ | $ | —
​ As of December 31, 2022, continuing operations has a federal net loss carryforward of $1.7 million and a state net loss carryforward of $1.6 million, both of which have an indefinite expiration date. Discontinued operations has a net loss carryforward of $17.9 million that will begin to expire, if unused, in various amounts between 2023 and 2032. The unused research & development tax credit carryforwards from continuing operations of $58,069 as of December 31, 2022 have an indefinite expiration date.

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- Definition The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 21 -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32857-109319 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 11.C) -URI https://asc.fasb.org/extlink&oid=122134291&loc=d3e330215-122817 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 17 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32809-109319 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I.5.Q1) -URI https://asc.fasb.org/extlink&oid=122134291&loc=d3e330036-122817 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 14 -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32705-109319 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 270 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6424409&loc=d3e44925-109338 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -URI https://asc.fasb.org/topic&trid=2144680 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=6424122&loc=d3e41874-109331 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)(2)) -URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 + Details
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