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Note O - Income Taxes - Components of Deferred Taxes (Details) - USD ($) | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Accrued compensation | $ 140,490 | $ 154,457
Allowance for credit losses | 20,626 | 20,513
Research and development expenses | 724,038 | 1,261,601
Capital loss carry forward | 114,885 | 114,251
Right-of-use operating lease assets | (5,979) | (16,346)
Operating lease liabilities | 0 | 16,406
Stock-based compensation | 54,258 | 34,299
Equipment and leasehold improvements | (1,951) | (6,268)
Impairment of investment | 712,500 | 0
Allowance for credit losses - Foreign | 20,626 | 20,513
Inventory reserve | 589,271 | 781,213
Other | 1,006 | 1,000
Tax credits | 1,116,119 | 1,554,541
Net operating loss and research and credit carryforwards | 11,686,140 | 11,824,622
Valuation allowance | (15,083,017) | (15,740,289)
Net deferred tax liability | 0 | 0
Income Tax Jurisdiction, Foreign [Member] |  |
Allowance for credit losses | 72,500 | 0
Deferred Tax Liability, Intangible Assets | (89,000) | 0
Allowance for credit losses - Foreign | $ 72,500 | $ 0

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