Note 13 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)	Nov. 30, 2021	Nov. 30, 2020
Accrued expenses	$ 82,000	$ 161,000
Inventory capitalization	122,000	71,000
NOL and tax credit carryforward	1,846,000	1,695,000
Asset reserves	613,000	796,000
Total current deferred tax assets	2,663,000	2,723,000
Property, plant, and equipment	(41,000)	(55,000)
Total non-current deferred tax assets (liabilities)	(41,000)	(55,000)
Net deferred taxes	$ 2,622,000	$ 2,668,000