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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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