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Note 5 - Supplemental Balance Sheet Information - Components of Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Property, plant and equipment, gross $ 85,353 $ 71,601
Less – Accumulated depreciation (62,828) (60,857)
Total 22,525 10,744
Land [Member]    
Property, plant and equipment, gross 1,273 123
Building and Building Improvements [Member]    
Property, plant and equipment, gross 8,148 8,267
Machinery and Equipment [Member]    
Property, plant and equipment, gross 62,562 51,261
Furniture and Fixtures [Member]    
Property, plant and equipment, gross 2,112 2,058
Computer Equipment [Member]    
Property, plant and equipment, gross 6,528 5,590
Construction in Progress [Member]    
Property, plant and equipment, gross $ 4,730 $ 4,302