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Note 4 - Property & Equipment - Property & Equipment (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Property and equipment, gross $ 52,878 $ 52,274
Less accumulated depreciation (36,559) (36,215)
Property and equipment, net 16,319 16,059
Land [Member]    
Property and equipment, gross 5,052 5,052
Land Improvements [Member]    
Property and equipment, gross 13,861 13,853
Building [Member]    
Property and equipment, gross 23,072 22,869
Machinery and Equipment [Member]    
Property and equipment, gross 10,500 10,500
Construction in Progress [Member]    
Property and equipment, gross $ 393 $ 0