Note 14 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)	Nov. 30, 2017	Nov. 30, 2016
Accrued expenses	$ 95,000	$ 110,000
Inventory capitalization	33,000	16,000
Net operating loss and tax credit carryforward	586,000	133,000
Asset reserves	746,000	808,000
Total current deferred tax assets	1,460,000	1,067,000
Property, plant, and equipment	(559,000)	(737,000)
Total non-current deferred tax assets (liabilities)	(559,000)	(737,000)
Net deferred taxes	$ 901,000	$ 330,000