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Note 6 - Supplemental Balance Sheet Information - Components of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2019	Sep. 30, 2018	Sep. 29, 2019	Sep. 30, 2018	Dec. 31, 2018
Property, plant and equipment, gross	$ 84,665		$ 84,665		$ 71,601
Less: Accumulated depreciation	(62,066)		(62,066)		(60,857)
Property, equipment and improvements, net	22,599		22,599		10,744	[1]
Depreciation	586	$ 496	1,548	$ 1,476
Land [Member]
Property, plant and equipment, gross	1,273		1,273		123
Building and Building Improvements [Member]
Property, plant and equipment, gross	15,257		15,257		8,267
Machinery and Equipment [Member]
Property, plant and equipment, gross	54,530		54,530		51,261
Furniture and Fixtures [Member]
Property, plant and equipment, gross	2,176		2,176		2,058
Computer Equipment [Member]
Property, plant and equipment, gross	6,672		6,672		5,590
Construction in Progress [Member]
Property, plant and equipment, gross	$ 4,757		$ 4,757		$ 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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