Note 13 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)	Nov. 30, 2020	Nov. 30, 2019
Accrued expenses	$ 161,000	$ 100,000
Inventory capitalization	71,000	21,000
NOL and tax credit carryforward	1,695,000	1,182,000
Asset reserves	796,000	621,000
Total current deferred tax assets	2,723,000	1,924,000
Property, plant, and equipment	(55,000)	(138,000)
Total non-current deferred tax assets (liabilities)	(55,000)	(138,000)
Net deferred taxes	$ 2,668,000	$ 1,786,000