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Note 13 - Segment Information - Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Net revenues | $ 32,558 | $ 29,571 | $ 64,477 | $ 53,652
Earnings before income tax expense | 3,365 | 2,570 | 6,759 | 3,225
Earnings before income tax expense | 3,365 | 2,570 | 6,759 | 3,225
Acquired intangible amortization | (523) | (765) | (1,067) | (1,547)
Interest expense | 176 | 141 | 358 | 278
Other income (expense) | 197 | (17) | 255 | (27)
Operating Segments [Member] |  |  |  |
Net revenues | 32,558 | 29,571 | 64,477 | 53,652
Earnings before income tax expense | 6,176 | 5,832 | 12,443 | 9,251
Earnings before income tax expense | 6,176 | 5,832 | 12,443 | 9,251
Operating Segments [Member] | Electronic Test [Member] |  |  |  |
Net revenues | 10,993 | 9,797 | 21,364 | 18,575
Earnings before income tax expense | 2,641 | 2,193 | 5,219 | 4,080
Earnings before income tax expense | 2,641 | 2,193 | 5,219 | 4,080
Operating Segments [Member] | Environmental Technologies [Member] |  |  |  |
Net revenues | 8,136 | 7,507 | 16,178 | 14,500
Earnings before income tax expense | 943 | 1,070 | 1,956 | 1,872
Earnings before income tax expense | 943 | 1,070 | 1,956 | 1,872
Operating Segments [Member] | Process Technologies [Member] |  |  |  |
Net revenues | 13,429 | 12,267 | 26,935 | 20,577
Earnings before income tax expense | 2,592 | 2,569 | 5,268 | 3,299
Earnings before income tax expense | 2,592 | 2,569 | 5,268 | 3,299
Corporate, Non-Segment [Member] |  |  |  |
Earnings before income tax expense | (2,309) | (2,339) | (4,514) | (4,174)
Earnings before income tax expense | $ (2,309) | $ (2,339) | $ (4,514) | $ (4,174)

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