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Note P - Income Taxes - Components of Deferred Taxes (Details) - USD ($) | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Accrued compensation | $ 154,457 | $ 112,201
Allowance for doubtful accounts | 20,513 | 90,405
Research and development expenses | 1,216,601 | 1,017,551
Capital loss carry forward | 114,251 | 114,251
Stock-based compensation | 34,299 | 32,408
Equipment and leasehold improvements | (6,268) | (12,353)
Reserve - Foreign | 0 | 150,000
Inventory reserve | 781,213 | 828,668
Interest expense | 0 | 0
Operating lease liabilities | (16,346) | 0
Other | 1,000 | 1,000
Tax credits | 1,554,541 | 1,748,235
Operating lease right-of-use assets | 16,406 | 206
Net operating loss and research and credit carryforwards | 11,824,622 | 13,277,118
Valuation allowance | (15,740,289) | (17,214,690)
Net deferred tax liability | 0 |
Domestic Tax Jurisdiction [Member] |  |
Intangible assets - US | 0 | 0
Foreign Tax Jurisdiction [Member] |  |
Deferred Tax Liability, Intangible Assets | $ 0 | $ (145,000)

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