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Note B - Summary of Significant Accounting Policies (Details Textual) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Cash and Cash Equivalents, at Carrying Value | $ 67,428 | $ 45,366 |
Cash, Uninsured Amount | 50,100 |  |
Asset Impairment Charges | 0 | 0 | $ 0
Product Warranty Accrual, Current | 277 | 255 |
Advertising Expense | $ 1,100 | $ 800 | $ 800
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
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Five Customers [Member] |  |  |
Concentration Risk, Percentage | 92.90% | 85.60% | 78.20%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Microsoft [Member] |  |  |
Concentration Risk, Percentage | 43.70% | 46.60% |
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Digicomm [Member] |  |  |
Concentration Risk, Percentage | 35.10% | 11.30% |
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Oracle [Member] |  |  |
Concentration Risk, Percentage | 12.40% |  |
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | ATX Networks Corporation [Member] |  |  |
Concentration Risk, Percentage |  | 15.60% |
Customer Concentration Risk [Member] | Accounts Receivable [Member] |  |  |
Number of Customers | 5 |  |
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Five Customers [Member] |  |  |
Concentration Risk, Percentage | 95.50% | 75.40% |
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Microsoft [Member] |  |  |
Concentration Risk, Percentage | 16.80% |  |
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Digicomm [Member] |  |  |
Concentration Risk, Percentage | 66.60% | 35.20% |
Customer Concentration Risk [Member] | Accounts Receivable [Member] | ATX Networks Corporation [Member] |  |  |
Concentration Risk, Percentage |  | 21.40% |
Non-US [Member] |  |  |
Cash and Cash Equivalents, at Carrying Value | $ 28,500 | $ 17,700 |

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