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Note 6 - Components of Assets Held for Sale (Details) - USD ($)
Apr. 03, 2016
Dec. 31, 2015
Land and Land Improvements [Member] | Toluca [Member]    
Property, plant and equipment, Gross   $ 1,568,000
Building and Building Improvements [Member] | Toluca [Member]    
Property, plant and equipment, Gross   3,658,000
Toluca [Member]    
Accumulated depreciation   (1,996,000)
Property, plant and equipment, net   3,230,000
Property, plant and equipment, net $ 0 $ 3,230,000