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Note 5 - Property, Plant and Equipment - Major Classes of Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Property, plant and equipment, gross $ 22,572 $ 21,703
Less: accumulated depreciation (9,976) (9,441)
Property, plant and equipment, net 12,596 12,261
Land [Member]    
Property, plant and equipment, gross 2,220 2,220
Building and Building Improvements [Member]    
Property, plant and equipment, gross 12,530 12,477
Machinery and Equipment [Member]    
Property, plant and equipment, gross 7,810 6,879
Construction in Progress [Member]    
Property, plant and equipment, gross $ 12 $ 127