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Note 8 - Property, Plant and Equipment - Property, Plant and Equipment Components (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Gross property, plant and equipment $ 80,941 $ 84,001
Accumulated depreciation (65,834) (66,868)
Property, Plant and Equipment, Net 15,107 17,133
Land and Land Improvements [Member]    
Gross property, plant and equipment 43 43
Building and Building Improvements [Member]    
Gross property, plant and equipment 8,241 8,507
Property, Plant and Equipment, Other Types [Member]    
Gross property, plant and equipment 71,950 74,588
Construction in Progress [Member]    
Gross property, plant and equipment $ 707 $ 863