Note 6 - Property, Plant, and Equipment - Major Classes of Property, Plant, and Equipment (Details) - USD ($)	Nov. 30, 2017	Nov. 30, 2016
Property, plant and equipment, gross	$ 18,676,666	$ 19,742,993
Less accumulated depreciation	(12,729,709)	(12,355,806)
Property, plant and equipment	5,946,957	7,387,187
Land [Member]
Property, plant and equipment, gross	220,503	536,103
Building and Building Improvements [Member]
Property, plant and equipment, gross	6,966,550	7,859,477
Construction in Progress [Member]
Property, plant and equipment, gross	14,798	10,353
Machinery and Equipment [Member]
Property, plant and equipment, gross	10,932,085	10,772,933
Vehicles [Member]
Property, plant and equipment, gross	428,774	450,171
Furniture and Fixtures [Member]
Property, plant and equipment, gross	$ 113,956	$ 113,956