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Note 16 - Segment Information - Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Net revenues | $ 29,571 | $ 21,820 | $ 53,652 | $ 41,376
Earnings before income tax expense | 2,570 | 3,056 | 3,225 | 5,634
Acquired intangible amortization | (765) | (305) | (1,547) | (609)
Other income (expense) | (158) | 21 | (305) | 19
Operating Segments [Member] |  |  |  |
Net revenues | 29,571 | 21,820 | 53,652 | 41,376
Earnings before income tax expense | 5,832 | 5,511 | 9,251 | 9,877
Operating Segments [Member] | Electronic Test [Member] |  |  |  |
Net revenues | 9,797 | 9,054 | 18,575 | 17,555
Earnings before income tax expense | 2,193 | 3,237 | 4,080 | 6,224
Operating Segments [Member] | Environmental Technologies [Member] |  |  |  |
Net revenues | 7,507 | 6,647 | 14,500 | 12,845
Earnings before income tax expense | 1,070 | 1,113 | 1,872 | 2,036
Operating Segments [Member] | Process Technologies [Member] |  |  |  |
Net revenues | 12,267 | 6,119 | 20,577 | 10,976
Earnings before income tax expense | 2,569 | 1,161 | 3,299 | 1,617
Corporate, Non-Segment [Member] |  |  |  |
Earnings before income tax expense | $ (2,339) | $ (2,171) | $ (4,174) | $ (3,653)

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