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Note 3 - Discontinued Operations - Financial Statement Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Oct. 06, 2022 | Dec. 31, 2023 | Dec. 31, 2022
(Loss) income from discontinued operations, net of tax | $ 0 | $ 0 | $ 0 | $ (28) | $ 132 | $ 488 | $ 457 | $ 808 |  | $ (28) | $ 1,885
Disposal Group, Not Discontinued Operations [Member] | MtronPTI [Member] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | 0 | 23,529
Total revenues |  |  |  |  |  |  |  |  |  | 0 | 23,529
Manufacturing cost of sales |  |  |  |  |  |  |  |  |  | 0 | 15,164
Engineering, selling and administrative |  |  |  |  |  |  |  |  |  | 28 | 5,870
Total expenses |  |  |  |  |  |  |  |  |  | 28 | 21,034
Operating (loss) income |  |  |  |  |  |  |  |  |  | (28) | 2,495
Interest expense, net |  |  |  |  |  |  |  |  |  | 0 | (6)
Other expense, net |  |  |  |  |  |  |  |  |  | 0 | (44)
(Loss) income from discontinued operations before income taxes |  |  |  |  |  |  |  |  |  | (28) | 2,445
Income tax provision |  |  |  |  |  |  |  |  |  | 0 | 560
(Loss) income from discontinued operations, net of tax |  |  |  |  |  |  |  |  |  | $ (28) | $ 1,885
Depreciation |  |  |  |  |  |  |  |  | $ 496 |  |
Amortization of finite-lived intangible assets |  |  |  |  |  |  |  |  | 42 |  |
Stock-based compensation expense |  |  |  |  |  |  |  |  | 26 |  |
Capital expenditures |  |  |  |  |  |  |  |  | $ (662) |  |

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