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Note 6 - Supplemental Balance Sheet Information - Components of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Property, plant and equipment, gross	$ 73,619	$ 71,601
Less: Accumulated Depreciation	(61,221)	(60,857)
Property, Equipment and Improvements, Net	12,398	10,744	[1]
Land [Member]
Property, plant and equipment, gross	123	123
Building and Building Improvements [Member]
Property, plant and equipment, gross	8,284	8,267
Machinery and Equipment [Member]
Property, plant and equipment, gross	51,772	51,261
Furniture and Fixtures [Member]
Property, plant and equipment, gross	2,073	2,058
Computer Equipment [Member]
Property, plant and equipment, gross	5,889	5,590
Construction in Progress [Member]
Property, plant and equipment, gross	$ 5,478	$ 4,302
[1] Effective January 1, 2019, the Company adopted Accounting Standards Codification Topic 842 (ASC 842), Leases. Shareholders’ equity as of December 31, 2018 has been adjusted for the effects of the new standard. See Note 1 for further information.

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