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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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