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Income taxes - Net long-term deferred tax liability (Details) - USD ($) | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Deferred tax assets: |  |
Research & development tax credits | $ 58,069 | $ 398,413
Loss carry forward | 443,076 | 300,545
Accrued compensation | 82,503 | 112,446
Operating lease liabilities | 412,840 | 469,398
Valuation allowances | (29,036) | (139,207)
Deferred tax assets | 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
Deferred Tax Liabilities, Gross | 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)
Deferred tax assets | $ 0 | $ 0

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