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Note 5 - Supplemental Balance Sheet Information - Components of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Property, plant and equipment, gross	$ 86,530		$ 86,530		$ 85,353
Less: Accumulated depreciation	(63,817)		(63,817)		(62,828)
Property, plant and equipment, net	22,713		22,713		22,525
Depreciation	582	$ 515	1,161	$ 962
Land [Member]
Property, plant and equipment, gross	1,273		1,273		1,273
Building and Building Improvements [Member]
Property, plant and equipment, gross	15,337		15,337		15,386
Machinery and Equipment [Member]
Property, plant and equipment, gross	54,904		54,904		55,058
Furniture and Fixtures [Member]
Property, plant and equipment, gross	2,188		2,188		2,194
Computer Equipment [Member]
Property, plant and equipment, gross	6,719		6,719		6,712
Construction in Progress [Member]
Property, plant and equipment, gross	$ 6,109		$ 6,109		$ 4,730

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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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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