Note B - Summary of Significant Accounting Policies (Details Textual) $ in Thousands	12 Months Ended
Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Cash and Cash Equivalents, at Carrying Value, Ending Balance	$ 43,425	$ 59,977
Cash, Uninsured Amount	$ 38,700
Number of Patents Issued	295
Asset Impairment Charges, Total	$ 0	0	$ 0
Product Warranty Accrual, Current	703	821
Advertising Expense	$ 400	$ 500	$ 500
Minimum [Member]
Product Warranty Extension Period (Year)	3 years
Maximum [Member]
Product Warranty Extension Period (Year)	5 years
Patents [Member] \| Minimum [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	10 years
Patents [Member] \| Maximum [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	20 years
Customer Concentration Risk [Member] \| Revenue Benchmark [Member]
Number of Customers	5	5	5
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Five Customers [Member]
Concentration Risk, Percentage	73.30%	80.70%	85.70%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Microsoft [Member]
Concentration Risk, Percentage	38.30%	32.20%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Amazon [Member]
Concentration Risk, Percentage	11.50%	24.00%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Facebook [Member]
Concentration Risk, Percentage		10.90%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Cisco [Member]
Concentration Risk, Percentage		10.00%
Customer Concentration Risk [Member] \| Accounts Receivable [Member]
Number of Customers	5	5
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Five Customers [Member]
Concentration Risk, Percentage	64.60%	82.00%
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Microsoft [Member]
Concentration Risk, Percentage	20.90%	32.00%
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Amazon [Member]
Concentration Risk, Percentage	8.50%	33.00%
Non-US [Member]
Cash and Cash Equivalents, at Carrying Value, Ending Balance	$ 10,700	$ 15,100

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The number of patents issued.

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The period of product warranty extension.

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Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers. For classified balance sheets, represents the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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