Note 1 - Summary of Significant Accounting Policies - Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Property, plant and equipment	$ 151,241	$ 143,336
Less accumulated depreciation and amortization	(84,636)	(78,325)
Property, plant and equipment, net	66,605	65,011	[1]
Land and Land Improvements [Member]
Property, plant and equipment	6,830	7,066
Building and Building Improvements [Member]
Property, plant and equipment	37,272	31,161
Machinery and Equipment [Member]
Property, plant and equipment	$ 107,139	$ 105,109

[1] Derived from December 31, 2022 audited financial statements