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Note 9 - Property, Plant and Equipment Components (Details) - USD ($)
Apr. 03, 2016
Dec. 31, 2015
Land and Land Improvements [Member]    
Gross property, plant and equipment $ 219,000 $ 219,000
Building and Building Improvements [Member]    
Gross property, plant and equipment 18,305,000 18,305,000
Property, Plant and Equipment, Other Types [Member]    
Gross property, plant and equipment 127,135,000 123,935,000
Construction in Progress [Member]    
Gross property, plant and equipment 717,000 759,000
Gross property, plant and equipment 146,376,000 143,218,000
Accumulated depreciation (122,218,000) (121,040,000)
Property plant and equipment net $ 24,158,000 $ 22,178,000