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Note 10 - Property, Plant and Equipment - Property, Plant and Equipment Components (Details) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Gross property, plant and equipment $ 87,416,000 $ 143,218,000
Accumulated depreciation (69,473,000) (121,040,000)
Property plant and equipment net 17,943,000 22,178,000
Land and Land Improvements [Member]    
Gross property, plant and equipment 219,000 219,000
Building and Building Improvements [Member]    
Gross property, plant and equipment 10,056,000 18,305,000
Accumulated depreciation (238,000)  
Property, Plant and Equipment, Other Types [Member]    
Gross property, plant and equipment 76,495,000 123,935,000
Construction in Progress [Member]    
Gross property, plant and equipment $ 646,000 $ 759,000