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Note 4 - Supplemental Balance Sheet Information - Components of Property, Plant and Equipment (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Property, plant and equipment, gross | $ 86,709 |  | $ 86,709 |  | $ 92,660
Depreciation | 760 | $ 815 | 2,282 | $ 2,450 |
Less: Accumulated depreciation | (65,543) |  | (65,543) |  | (70,944)
Property, plant and equipment, net | 21,166 |  | 21,166 |  | 21,716
Land [Member] |  |  |  |  |
Property, plant and equipment, gross | 1,273 |  | 1,273 |  | 1,273
Building and Building Improvements [Member] |  |  |  |  |
Property, plant and equipment, gross | 15,934 |  | 15,934 |  | 15,572
Machinery and Equipment [Member] |  |  |  |  |
Property, plant and equipment, gross | 57,164 |  | 57,164 |  | 63,981
Furniture and Fixtures [Member] |  |  |  |  |
Property, plant and equipment, gross | 2,822 |  | 2,822 |  | 2,845
Computer Equipment [Member] |  |  |  |  |
Property, plant and equipment, gross | 7,807 |  | 7,807 |  | 7,744
Construction in Progress [Member] |  |  |  |  |
Property, plant and equipment, gross | $ 1,709 |  | $ 1,709 |  | $ 1,245

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