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Note 4 - Supplemental Balance Sheet Information - Components of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Property, plant and equipment, gross	$ 90,422		$ 90,422		$ 88,070
Finished goods	7,739		7,739		7,505
Less: Accumulated depreciation	(67,387)		(67,387)		(65,220)
Property, plant and equipment, net	23,035		23,035		22,850
Depreciation	700	$ 582	2,160	$ 1,743
Land [Member]
Property, plant and equipment, gross	1,273		1,273		1,273
Building and Building Improvements [Member]
Property, plant and equipment, gross	15,425		15,425		15,393
Machinery and Equipment [Member]
Property, plant and equipment, gross	62,449		62,449		61,048
Furniture and Fixtures [Member]
Property, plant and equipment, gross	2,503		2,503		2,235
Computer Equipment [Member]
Finished goods	7,316		7,316		6,894
Construction in Progress [Member]
Finished goods	$ 1,456		$ 1,456		$ 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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