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Note 4 - Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Goodwill | $ 21,728 | $ 21,605 | $ 21,448
Finite-lived, Gross Carrying Amount | 20,801 | 20,660 |
Finite-lived, Accumulated Amortization | 12,603 | 10,470 |
Net Carrying Amount, finite-lived | 8,198 | 10,190 | 13,206
Indefinite-lived, Gross Carrying Amount | 8,398 | 8,369 | 8,428
Net Carrying Amount, indefinite-lived | 8,398 | 8,369 | $ 8,428
Intangible Assets, Gross Carrying Amount | 29,199 | 29,029 |
Net Carrying Amount | 16,596 | 18,559 |
Trademarks [Member] |  |  |
Indefinite-lived, Gross Carrying Amount | 8,398 | 8,369 |
Net Carrying Amount, indefinite-lived | 8,398 | 8,369 |
Customer Relationships [Member] |  |  |
Finite-lived, Gross Carrying Amount | 16,407 | 16,313 |
Finite-lived, Accumulated Amortization | 9,687 | 7,990 |
Net Carrying Amount, finite-lived | 6,720 | 8,323 |
Patented Technology [Member] |  |  |
Finite-lived, Gross Carrying Amount | 2,895 | 2,855 |
Finite-lived, Accumulated Amortization | 1,417 | 988 |
Net Carrying Amount, finite-lived | 1,478 | 1,867 |
Patents [Member] |  |  |
Finite-lived, Gross Carrying Amount | 590 | 590 |
Finite-lived, Accumulated Amortization | 590 | 590 |
Net Carrying Amount, finite-lived |  | 0 |
Customer Backlog [Member] |  |  |
Finite-lived, Gross Carrying Amount | 499 | 492 |
Finite-lived, Accumulated Amortization | 499 | 492 |
Net Carrying Amount, finite-lived |  | 0 |
Computer Software, Intangible Asset [Member] |  |  |
Finite-lived, Gross Carrying Amount | 270 | 270 |
Finite-lived, Accumulated Amortization | 270 | 270 |
Net Carrying Amount, finite-lived |  | 0 |
Trade Names [Member] |  |  |
Finite-lived, Gross Carrying Amount | 140 | 140 |
Finite-lived, Accumulated Amortization | 140 | 140 |
Net Carrying Amount, finite-lived |  | 0 |
Electronic Test [Member] |  |  |
Goodwill | 3,436 | 3,369 |
Environmental Technologies [Member] |  |  |
Goodwill | 1,817 | 1,817 |
Process Technologies [Member] |  |  |
Goodwill | $ 16,475 | $ 16,419 |

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