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Note 4 - Property - Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Property, plant and equipment, gross $ 52,267 $ 52,164
Less accumulated depreciation 33,407 32,445
Property, net 18,860 19,719
Land [Member]    
Property, plant and equipment, gross 5,073 5,073
Land Improvements [Member]    
Property, plant and equipment, gross 13,153 13,153
Building [Member]    
Property, plant and equipment, gross 23,439 23,439
Machinery and Equipment [Member]    
Property, plant and equipment, gross 10,520 10,495
Construction in Progress [Member]    
Property, plant and equipment, gross $ 82 $ 4