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Note 8 - Property, Plant & Equipment - Property, Plant and Equipment (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Property, plant and equipment, gross | $ 373,501 | $ 376,001
Less accumulated depreciation and amortization | (171,505) | (167,772)
Property, plant and equipment, net before construction in progress and land | 201,996 | 208,229
Property, plant and equipment, net | 236,774 | 243,035
Land Improvements [Member] |  |
Property, plant and equipment, gross | 806 | 806
Building and Building Improvements [Member] |  |
Property, plant and equipment, gross | 89,248 | 89,698
Machinery and Equipment [Member] |  |
Property, plant and equipment, gross | 264,554 | 266,386
Furniture and Fixtures [Member] |  |
Property, plant and equipment, gross | 5,639 | 5,658
Computer Equipment and Software [Member] |  |
Property, plant and equipment, gross | 12,517 | 12,727
Vehicles [Member] |  |
Property, plant and equipment, gross | 737 | 726
Construction in Progress [Member] |  |
Property, plant and equipment, net | 33,677 | 33,705
Land [Member] |  |
Property, plant and equipment, net | $ 1,101 | $ 1,101

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