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Note S - Income Taxes - Components of Deferred Taxes (Details) - USD ($) | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Accrued compensation | $ 84,000 | $ 91,000
Accounts receivable allowance | 474,000 | 474,000
Stock-based compensation | 894,000 | 644,000
Basis differences in fixed assets | (5,000) | (13,000)
Basis differences in intangible assets | 62,000 | 50,000
Net operating loss and credit carryforwards | 15,002,000 | 12,735,000
Valuation allowances | $ (16,511,000) | $ (13,981,000)

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