Note 4 - Property (Details) - USD ($) $ in Thousands	Mar. 31, 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	37,103	36,608
Net property	$ 31,953	$ 32,518