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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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