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Note 14 - Segment Information - Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Net revenues | $ 30,941 | $ 30,771 | $ 95,418 | $ 84,423
Earnings before income tax expense | 2,723 | 3,039 | 9,482 | 6,264
Earnings before income tax expense | 2,723 | 3,039 | 9,482 | 6,264
Acquired intangible amortization | (515) | (595) | (1,582) | (2,142)
Interest expense | 168 | 179 | 526 | 457
Other income (expense) | 423 | 59 | 678 | 32
Operating Segments [Member] |  |  |  |
Net revenues | 30,941 | 30,771 | 95,418 | 84,423
Earnings before income tax expense | 5,885 | 5,892 | 18,328 | 15,143
Earnings before income tax expense | 5,885 | 5,892 | 18,328 | 15,143
Operating Segments [Member] | Electronic Test [Member] |  |  |  |
Net revenues | 11,547 | 10,408 | 32,911 | 28,983
Earnings before income tax expense | 3,268 | 2,406 | 8,487 | 6,486
Earnings before income tax expense | 3,268 | 2,406 | 8,487 | 6,486
Operating Segments [Member] | Environmental Technologies [Member] |  |  |  |
Net revenues | 7,000 | 7,631 | 23,178 | 22,131
Earnings before income tax expense | 523 | 1,021 | 2,479 | 2,893
Earnings before income tax expense | 523 | 1,021 | 2,479 | 2,893
Operating Segments [Member] | Process Technologies [Member] |  |  |  |
Net revenues | 12,394 | 12,732 | 39,329 | 33,309
Earnings before income tax expense | 2,094 | 2,465 | 7,362 | 5,764
Earnings before income tax expense | 2,094 | 2,465 | 7,362 | 5,764
Corporate, Non-Segment [Member] |  |  |  |
Earnings before income tax expense | (2,902) | (2,138) | (7,416) | (6,312)
Earnings before income tax expense | $ (2,902) | $ (2,138) | $ (7,416) | $ (6,312)

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