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Note 5 - Supplemental Balance Sheet Information - Components of Property, Plant and Equipment (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Mar. 31, 2022 | Dec. 31, 2021
Property, plant and equipment, gross | $ 91,888 |  | $ 91,888 |  |  | $ 91,423
Depreciation | 819 | $ 730 | 1,635 | $ 1,460 |  |
Less: Accumulated depreciation | (69,550) |  | (69,550) |  |  | (68,218)
Property, plant and equipment, net | 22,338 |  | 22,338 |  | $ 22,338 | 23,205
Land [Member] |  |  |  |  |  |
Property, plant and equipment, gross | 1,273 |  | 1,273 |  |  | 1,273
Building and Building Improvements [Member] |  |  |  |  |  |
Property, plant and equipment, gross | 15,522 |  | 15,522 |  |  | 15,442
Machinery and Equipment [Member] |  |  |  |  |  |
Property, plant and equipment, gross | 63,930 |  | 63,930 |  |  | 63,780
Furniture and Fixtures [Member] |  |  |  |  |  |
Property, plant and equipment, gross | 2,756 |  | 2,756 |  |  | 2,588
Computer Equipment [Member] |  |  |  |  |  |
Property, plant and equipment, gross | 7,583 |  | 7,583 |  |  | 7,579
Construction in Progress [Member] |  |  |  |  |  |
Property, plant and equipment, gross | $ 824 |  | $ 824 |  |  | $ 761

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