Note 4 - Supplemental Balance Sheet Information - Components of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Property, plant and equipment, gross	$ 87,302		$ 87,302		$ 87,601
Depreciation	789	$ 760	1,529	$ 1,522
Less: Accumulated depreciation	(67,021)		(67,021)		(66,484)
Property, plant and equipment, net	20,281		20,281		21,117
Land [Member]
Property, plant and equipment, gross	1,273		1,273		1,273
Building and Building Improvements [Member]
Property, plant and equipment, gross	16,064		16,064		15,998
Machinery and Equipment [Member]
Property, plant and equipment, gross	57,494		57,494		57,584
Furniture and Fixtures [Member]
Property, plant and equipment, gross	2,809		2,809		2,845
Computer Equipment [Member]
Property, plant and equipment, gross	7,816		7,816		7,868
Construction in Progress [Member]
Property, plant and equipment, gross	$ 1,846		$ 1,846		$ 2,033

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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