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Note 4 - Supplemental Balance Sheet Information - Components of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Property, plant and equipment, gross	$ 88,890	$ 88,070
Finished goods	8,052	7,505
Less: Accumulated depreciation	(65,944)	(65,220)
Property, plant and equipment, net	22,946	22,850
Land [Member]
Property, plant and equipment, gross	1,273	1,273
Building and Building Improvements [Member]
Property, plant and equipment, gross	15,396	15,393
Machinery and Equipment [Member]
Property, plant and equipment, gross	61,413	61,048
Furniture and Fixtures [Member]
Property, plant and equipment, gross	2,286	2,235
Computer Equipment [Member]
Finished goods	7,102	6,894
Construction in Progress [Member]
Finished goods	$ 1,420	$ 1,227

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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