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Note Q - Income Taxes - Components of Deferred Taxes (Details) - USD ($) | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Current asset: |  |
Accrued compensation | $ 67,000 | $ 75,000
Accounts receivable allowance | 202,000 | 5,000
Stock-based compensation | 360,000 | 258,000
Basis differences in fixed assets | (8,000) | (16,000)
Basis differences in intangible assets | 60,000 | 55,000
Net operating loss and credit carryforwards | 18,597,000 | 17,994,000
Valuation allowances | $ (19,278,000) | $ (18,371,000)

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