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Note 6 - Property, Plant, and Equipment - Major Classes of Property, Plant, and Equipment (Details) - USD ($)
Nov. 30, 2016
Nov. 30, 2015
Property, plant and equipment, gross $ 19,742,993 $ 20,667,681
Less accumulated depreciation (12,355,806) (12,843,418)
Property, plant and equipment 7,387,187 7,824,263
Land [Member]    
Property, plant and equipment, gross 536,103 536,103
Building and Building Improvements [Member]    
Property, plant and equipment, gross 7,859,477 7,832,061
Construction in Progress [Member]    
Property, plant and equipment, gross 10,353 10,353
Manufacturing Machinery and Equipment [Member]    
Property, plant and equipment, gross 10,772,933 11,742,106
Trucks and Automobiles [Member]    
Property, plant and equipment, gross 450,171 432,806
Furniture and Fixtures [Member]    
Property, plant and equipment, gross $ 113,956 $ 114,252