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Note 3 - Supplemental Balance Sheet Information - Components of Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Property, plant and equipment, gross $ 87,601 $ 92,660
Less – Accumulated depreciation (66,484) (70,944)
Total 21,117 21,716
Land [Member]    
Property, plant and equipment, gross 1,273 1,273
Building and Building Improvements [Member]    
Property, plant and equipment, gross 15,998 15,572
Machinery and Equipment [Member]    
Property, plant and equipment, gross 57,584 63,981
Furniture and Fixtures [Member]    
Property, plant and equipment, gross 2,845 2,845
Computer Equipment [Member]    
Property, plant and equipment, gross 7,868 7,744
Construction in Progress [Member]    
Property, plant and equipment, gross $ 2,033 $ 1,245