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Note B - Summary of Significant Accounting Policies (Details Textual) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Cash and Cash Equivalents, at Carrying Value, Ending Balance | $ 34,656 | $ 43,425 |
Cash, Uninsured Amount | $ 23,100 |  |
Number of Patents Issued | 328 |  |
Asset Impairment Charges, Total | $ 0 | 0 | $ 0
Product Warranty Accrual, Current | 263 | 703 |
Advertising Expense | $ 100 | $ 400 | $ 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 | 67.00% | 73.30% | 80.70%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | ATX Networks Corporation [Member] |  |  |
Concentration Risk, Percentage | 25.60% |  |
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Microsoft [Member] |  |  |
Concentration Risk, Percentage | 14.10% | 38.30% |
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Cisco [Member] |  |  |
Concentration Risk, Percentage | 11.90% |  |
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Amazon [Member] |  |  |
Concentration Risk, Percentage |  | 11.50% |
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 | 70.60% | 64.60% |
Customer Concentration Risk [Member] | Accounts Receivable [Member] | ATX Networks Corporation [Member] |  |  |
Concentration Risk, Percentage | 41.70% |  |
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Microsoft [Member] |  |  |
Concentration Risk, Percentage |  | 8.50% |
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Cisco [Member] |  |  |
Concentration Risk, Percentage | 3.50% |  |
Non-US [Member] |  |  |
Cash and Cash Equivalents, at Carrying Value, Ending Balance | $ 17,300 | $ 10,700 |

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