Note 8 - Property, Plant and Equipment, Net - Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Property, plant and equipment, gross	$ 148,062	$ 146,749
Accumulated depreciation	(109,852)	(112,248)
Property, plant and equipment, net	38,210	34,501
Land [Member]
Property, plant and equipment, gross	1,105	1,115
Building and Building Improvements [Member]
Property, plant and equipment, gross	20,915	19,917
Machinery and Equipment [Member]
Property, plant and equipment, gross	120,961	124,114
Construction in Progress [Member]
Property, plant and equipment, gross	$ 5,081	$ 1,603

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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