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Note T - Income Taxes - Components of Deferred Taxes (Details) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Accrued compensation | $ 81,000 | $ 84,000
Accounts receivable allowance | 474,000 | 474,000
Stock-based compensation | 1,073,000 | 894,000
Basis differences in fixed assets | (14,000) | (5,000)
Basis differences in intangible assets | 65,000 | 62,000
Net operating loss and credit carryforwards | 13,337,000 | 15,002,000
Valuation allowances | $ (15,016,000) | $ (16,511,000)

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