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Note 4 - Supplemental Balance Sheet Information - Components of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Property, plant and equipment, gross	$ 93,164	$ 92,660
Less: Accumulated depreciation	(71,752)	(70,944)
Property, plant and equipment, net	21,412	21,716
Land [Member]
Property, plant and equipment, gross	1,273	1,273
Building and Building Improvements [Member]
Property, plant and equipment, gross	15,605	15,572
Machinery and Equipment [Member]
Property, plant and equipment, gross	64,132	63,981
Furniture and Fixtures [Member]
Property, plant and equipment, gross	2,825	2,845
Computer Equipment [Member]
Property, plant and equipment, gross	7,687	7,744
Construction in Progress [Member]
Property, plant and equipment, gross	$ 1,642	$ 1,245

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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