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Note 13 - Segment Information - Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Net revenues | $ 31,919 | $ 24,081
Earnings before income tax expense | 3,394 | 655
Earnings before income tax expense | 3,394 | 655
Acquired intangible amortization | (544) | (782)
Interest expense | 182 | 137
Other income (expense) | 58 | (10)
Operating Segments [Member] |  |
Net revenues | 31,919 | 24,081
Earnings before income tax expense | 6,267 | 3,419
Earnings before income tax expense | 6,267 | 3,419
Operating Segments [Member] | Electronic Test [Member] |  |
Net revenues | 10,371 | 8,778
Earnings before income tax expense | 2,578 | 1,887
Earnings before income tax expense | 2,578 | 1,887
Operating Segments [Member] | Environmental Technologies [Member] |  |
Net revenues | 8,042 | 6,993
Earnings before income tax expense | 1,013 | 802
Earnings before income tax expense | 1,013 | 802
Operating Segments [Member] | Process Technologies [Member] |  |
Net revenues | 13,506 | 8,310
Earnings before income tax expense | 2,676 | 730
Earnings before income tax expense | 2,676 | 730
Corporate, Non-Segment [Member] |  |
Earnings before income tax expense | (2,205) | (1,835)
Earnings before income tax expense | $ (2,205) | $ (1,835)

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