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Note 3 - Supplemental Balance Sheet Information - Components of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Property, plant and equipment, gross	$ 71,601	$ 66,711
Less – Accumulated Depreciation	(60,857)	(59,141)
Total	10,744	7,570
Land [Member]
Property, plant and equipment, gross	123	123
Building and Building Improvements [Member]
Property, plant and equipment, gross	8,267	7,858
Machinery and Equipment [Member]
Property, plant and equipment, gross	51,261	50,852
Furniture and Fixtures [Member]
Property, plant and equipment, gross	2,058	2,005
Computer Equipment [Member]
Property, plant and equipment, gross	5,590	5,338
Construction in Progress [Member]
Property, plant and equipment, gross	$ 4,302	$ 535

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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