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Note 5 - Toluca Sale-leaseback - Components of Assets Held for Sale (Details) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Property, plant and equipment, Gross $ 832,000  
Accumulated depreciation (5,841,000)  
Property, plant and equipment, net $ 832,000 $ 3,230,000
Toluca [Member]    
Accumulated depreciation   (1,996,000)
Property, plant and equipment, net   3,230,000
Toluca [Member] | Land and Land Improvements [Member]    
Property, plant and equipment, Gross   1,568,000
Toluca [Member] | Building and Building Improvements [Member]    
Property, plant and equipment, Gross   $ 3,658,000