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Note 8 - Property, Plant and Equipment - Property, Plant and Equipment Components (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Gross property, plant and equipment $ 84,807 $ 84,001
Accumulated depreciation (68,101) (66,868)
Property, Plant and Equipment, Net 16,706 17,133
Land and Land Improvements [Member]    
Gross property, plant and equipment 43 43
Building and Building Improvements [Member]    
Gross property, plant and equipment 8,568 8,507
Property, Plant and Equipment, Other Types [Member]    
Gross property, plant and equipment 75,579 74,588
Construction in Progress [Member]    
Gross property, plant and equipment $ 617 $ 863