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Note B - Summary of Significant Accounting Policies (Details Textual) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Cash and Cash Equivalents, at Carrying Value | $ 45,366 | $ 24,685 |
Cash, Uninsured Amount | 36,800 |  |
Asset Impairment Charges | 0 | 0 | $ 0
Product Warranty Accrual, Current | 255 | 140 |
Advertising Expense | $ 800 | $ 800 | $ 100
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 | 85.60% | 78.20% | 67.00%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Microsoft [Member] |  |  |
Concentration Risk, Percentage | 46.60% | 18.40% |
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | ATX Networks Corporation [Member] |  |  |
Concentration Risk, Percentage | 15.60% | 47.30% |
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Digicomm [Member] |  |  |
Concentration Risk, Percentage | 11.30% |  |
Customer Concentration Risk [Member] | Accounts Receivable [Member] |  |  |
Number of Customers | 5 |  |
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Five Customers [Member] |  |  |
Concentration Risk, Percentage | 75.40% | 86.90% |
Customer Concentration Risk [Member] | Accounts Receivable [Member] | ATX Networks Corporation [Member] |  |  |
Concentration Risk, Percentage | 21.40% | 64.90% |
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Digicomm [Member] |  |  |
Concentration Risk, Percentage | 35.20% |  |
Non-US [Member] |  |  |
Cash and Cash Equivalents, at Carrying Value | $ 17,700 | $ 17,500 |

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