Note 7 - Property, Plant and Equipment, Net - Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Property, plant and equipment, gross	$ 148,227	$ 145,224
Accumulated depreciation	(109,729)	(108,391)
Property, plant and equipment, net	38,498	36,833
Land [Member]
Property, plant and equipment, gross	1,103	1,098
Building and Building Improvements [Member]
Property, plant and equipment, gross	21,517	21,529
Machinery and Equipment [Member]
Property, plant and equipment, gross	120,055	118,358
Construction in Progress [Member]
Property, plant and equipment, gross	$ 5,552	$ 4,239