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Note 19 - Segment Information - Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | [1] | Sep. 30, 2021 | [2] | Jun. 30, 2021 | [3] | Mar. 31, 2021 | [4] | Dec. 31, 2022 | Dec. 31, 2021
Net revenues | $ 32,405 | $ 30,771 | $ 29,571 | $ 24,081 | $ 22,358 | $ 21,144 | $ 21,820 | $ 19,556 | $ 116,828 | $ 84,878
Earnings before income tax expense | $ 3,881 | $ 3,039 | $ 2,570 | $ 655 | $ 236 | $ 2,532 | $ 3,056 | $ 2,578 | 10,145 | 8,402
Acquired intangible amortization |  |  |  |  |  |  |  |  | (2,694) | (1,440)
Other income (expense) |  |  |  |  |  |  |  |  | (576) | (57)
Operating Segments [Member] |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 116,828 | 84,878
Earnings before income tax expense |  |  |  |  |  |  |  |  | 21,978 | 18,981
Operating Segments [Member] | Electronic Test [Member] |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 40,219 | 32,509
Earnings before income tax expense |  |  |  |  |  |  |  |  | 9,931 | 10,926
Operating Segments [Member] | Environmental Technologies [Member] |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 30,172 | 26,896
Earnings before income tax expense |  |  |  |  |  |  |  |  | 3,817 | 4,236
Operating Segments [Member] | Process Technologies [Member] |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 46,437 | 25,473
Earnings before income tax expense |  |  |  |  |  |  |  |  | 8,230 | 3,819
Corporate, Non-Segment [Member] |  |  |  |  |  |  |  |  |  |
Earnings before income tax expense |  |  |  |  |  |  |  |  | $ (8,563) | $ (9,082)
[1] | The quarter ended December 31, 2021 includes a recovery of $17 of restructuring and other charges which are discussed in Note 5.
[2] | The quarter ended September 30, 2021 includes $51 of restructuring and other charges which are discussed in Note 5.
[3] | The quarter ended June 30, 2021 includes $197 of restructuring and other charges which are discussed in Note 5.
[4] | The quarter ended March 31, 2021 includes $55 of restructuring and other charges which are discussed in Note 5.

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