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Income taxes (Tables)
 12 Months Ended
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:
 20242023
Pre-tax book income (loss)$(4,651,205)$(4,490,665)
Expected tax at 21%
(976,753)(943,040)
Permanent differences:
Goodwill impairment45,632 — 
Intangible amortization (37,003)(46,373)
Other5,169 6,474 
State taxes:
Current22,565 32,491 
Deferred(234,928)(264,759)
Other items:
Expired net operating losses324,799 — 
Federal research and development credits— (84,592)
Deferred tax past year true-ups(91,289)(63,440)
Change in valuation allowance920,794 980,342 
Capitalized research and development expenses— 334,120 
Other43,579 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:
 20242023
Net operating loss carryforwards$12,025,000 $10,840,000 
R&D and ITC credit carryforwards396,000 403,000 
Accrued expenses and other267,000 381,000 
Intangibles370,000 499,000 
Leases— 8,000 
Accounts receivable76,000 39,000 
Stock options486,000 450,000 
Inventory279,000 427,000 
Property, plant and equipment578,000 650,000 
Other464,000 323,000 
Deferred tax assets14,941,000 14,020,000 
Valuation allowance(14,941,000)(14,020,000)
Deferred tax assets, net$— $—