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Note 4 - Supplemental Balance Sheet Information - Components of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Property, plant and equipment, gross	$ 89,430		$ 89,430		$ 88,070
Finished goods	7,480		7,480		7,505
Less: Accumulated depreciation	(66,710)		(66,710)		(65,220)
Property, plant and equipment, net	22,720		22,720		22,850
Depreciation	730	$ 582	1,460	$ 1,161
Land [Member]
Property, plant and equipment, gross	1,273		1,273		1,273
Building and Building Improvements [Member]
Property, plant and equipment, gross	15,407		15,407		15,393
Machinery and Equipment [Member]
Property, plant and equipment, gross	62,109		62,109		61,048
Furniture and Fixtures [Member]
Property, plant and equipment, gross	2,328		2,328		2,235
Computer Equipment [Member]
Finished goods	7,124		7,124		6,894
Construction in Progress [Member]
Finished goods	$ 1,189		$ 1,189		$ 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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