Note 4 - Property, Plant and Equipment - Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Property, Plant and Equipment	$ 25,248	$ 25,004
Less accumulated depreciation and amortization	(18,217)	(17,999)
Property, plant and equipment, net	7,031	7,005
Building and Building Improvements [Member]
Property, Plant and Equipment	9,045	9,020
Machinery and Equipment [Member]
Property, Plant and Equipment	15,803	15,768
Construction in Progress [Member]
Property, Plant and Equipment	$ 400	$ 216