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Note 10 - Property, Plant and Equipment Components (Details) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Land and Land Improvements [Member]    
Gross property, plant and equipment $ 219,000 $ 2,770,000
Building and Building Improvements [Member]    
Gross property, plant and equipment 18,305,000 26,055,000
Property, Plant and Equipment, Other Types [Member]    
Gross property, plant and equipment 123,935,000 158,816,000
Construction in Progress [Member]    
Gross property, plant and equipment 759,000 2,100,000
Gross property, plant and equipment 143,218,000 189,741,000
Accumulated depreciation (121,040,000) (152,087,000)
Property plant and equipment net $ 22,178,000 $ 37,654,000