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Note P - Income Taxes - Components of Deferred Taxes (Details) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Accrued compensation | $ 91,000 | $ 118,000
Accounts receivable allowance | 474,000 | 277,000
Stock-based compensation | 644,000 | 387,000
Basis differences in fixed assets | (13,000) | (18,000)
Basis differences in intangible assets | 50,000 | 46,000
Net operating loss and credit carryforwards | 12,735,000 | 12,052,000
Valuation allowances | $ (13,981,000) | $ (12,862,000)

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