Note 15 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)	Nov. 30, 2019	Nov. 30, 2018
Accrued expenses	$ 100,000	$ 59,000
Inventory capitalization	21,000	73,000
NOL and tax credit carryforward	1,182,000	826,000
Asset reserves	621,000	609,000
Total current deferred tax assets	1,924,000	1,567,000
Property, plant, and equipment	(138,000)	(135,000)
Total non-current deferred tax assets (liabilities)	(138,000)	(135,000)
Net deferred taxes	$ 1,786,000	$ 1,432,000