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Income taxes (Tables) | 12 Months Ended
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Dec. 31, 2024
Income Tax Disclosure [Abstract] |
Reconciliation of Federal Statutory Income Tax Provision To Company's Actual Provision | A reconciliation of the federal statutory income tax provision to our actual provision for the years ended December 31, 2024 and 2023 is as follows:
|  |  | 2024 |  |  | 2023 |
Pre-tax book income (loss) |  | $ | (4,651,205) |  |  |  | $ | (4,490,665) |  |
Expected tax at 21% |  | (976,753) |  |  |  | (943,040) |  |
Permanent differences: |  |  |  |  |  |
| Goodwill impairment |  | 45,632 |  |  |  | — |  |
| Intangible amortization |  | (37,003) |  |  |  | (46,373) |  |
| Other |  | 5,169 |  |  |  | 6,474 |  |
State taxes: |  |  |  |  |  |
| Current |  | 22,565 |  |  |  | 32,491 |  |
| Deferred |  | (234,928) |  |  |  | (264,759) |  |
Other items: |  |  |  |  |  |
| Expired net operating losses |  | 324,799 |  |  |  | — |  |
| Federal research and development credits |  | — |  |  |  | (84,592) |  |
| Deferred tax past year true-ups |  | (91,289) |  |  |  | (63,440) |  |
| Change in valuation allowance |  | 920,794 |  |  |  | 980,342 |  |
| Capitalized research and development expenses |  | — |  |  |  | 334,120 |  |
| Other |  | 43,579 |  |  |  | 81,268 |  |
Income tax provision |  | $ | 22,565 |  |  |  | $ | 32,491 |  |
Schedule of Deferred Tax Assets | The components of net deferred tax assets recognized in the accompanying consolidated balance sheets at December 31, 2024 and 2023 are as follows:
|  | 2024 |  | 2023
| Net operating loss carryforwards | $ | 12,025,000 |  |  | $ | 10,840,000 |
| R&D and ITC credit carryforwards | 396,000 |  |  | 403,000 |
| Accrued expenses and other | 267,000 |  |  | 381,000 |
| Intangibles | 370,000 |  |  | 499,000 |
| Leases | — |  |  | 8,000 |
| Accounts receivable | 76,000 |  |  | 39,000 |
| Stock options | 486,000 |  |  | 450,000 |
| Inventory | 279,000 |  |  | 427,000 |
| Property, plant and equipment | 578,000 |  |  | 650,000 |
| Other | 464,000 |  |  | 323,000 |
| Deferred tax assets | 14,941,000 |  |  | 14,020,000 |
| Valuation allowance | (14,941,000) |  |  | (14,020,000) |
| Deferred tax assets, net | $ | — |  |  | $ | — |

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