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Note 4 - Property (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Land [Member]    
Property, plant, and equipment, gross $ 5,063 $ 5,133
Land Improvements [Member]    
Property, plant, and equipment, gross 19,687 19,687
Building [Member]    
Property, plant, and equipment, gross 32,589 32,589
Machinery and Equipment [Member]    
Property, plant, and equipment, gross 11,717 11,717
Property, plant, and equipment, gross 69,056 69,126
Less accumulated depreciation 37,596 36,608
Net property $ 31,460 $ 32,518