Note 4 - Property, Plant and Equipment - Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Property, Plant and Equipment	$ 24,964	$ 24,056
Less accumulated depreciation and amortization	(17,821)	(17,078)
Property, plant and equipment, net	7,143	6,978
Building and Building Improvements [Member]
Property, Plant and Equipment	8,937	8,447
Machinery and Equipment [Member]
Property, Plant and Equipment	15,791	15,503
Construction in Progress [Member]
Property, Plant and Equipment	$ 236	$ 106