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Note 6 - Supplemental Balance Sheet Information - Components of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jul. 01, 2018	Jun. 30, 2019	Jul. 01, 2018	Dec. 31, 2018
Property, plant and equipment, gross	$ 83,665		$ 83,665		$ 71,601
Less: Accumulated depreciation	(61,587)		(61,587)		(60,857)
Property, equipment and improvements, net	22,078		22,078		10,744	[1]
Depreciation	515	$ 496	962	$ 980
Land [Member]
Property, plant and equipment, gross	1,273		1,273		123
Building and Building Improvements [Member]
Property, plant and equipment, gross	15,285		15,285		8,267
Machinery and Equipment [Member]
Property, plant and equipment, gross	53,774		53,774		51,261
Furniture and Fixtures [Member]
Property, plant and equipment, gross	2,177		2,177		2,058
Computer Equipment [Member]
Property, plant and equipment, gross	6,120		6,120		5,590
Construction in Progress [Member]
Property, plant and equipment, gross	$ 5,036		$ 5,036		$ 4,302
[1] Effective January 1, 2019, the Company adopted Accounting Standards Codification Topic 842 (ASC 842), Leases. Prior period balances have been adjusted for the effects of the new standard. See Note 1 for further information.

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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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