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Note P - Income Taxes - Components of Deferred Taxes (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Current asset:
Accrued compensation	$ 118,000	$ 67,000
Accounts receivable allowance	277,000	202,000
Stock-based compensation	387,000	360,000
Basis differences in fixed assets	(18,000)	(8,000)
Basis differences in intangible assets	46,000	60,000
Net operating loss and credit carryforwards	12,052,000	18,597,000
Valuation allowances	$ (12,862,000)	$ (19,278,000)

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