Note 6 - Net Income (Loss) Per Share of Common Stock - Basic and Diluted Earnings Per Common Share (Details) - USD ($)	3 Months Ended		9 Months Ended
	Aug. 31, 2023	Aug. 31, 2022	Aug. 31, 2023	Aug. 31, 2022
Numerator for basic and diluted net income (loss) per share:
Net income (loss) from continuing operations	$ 240,873	$ 304,007	$ 920,929	$ 190,681
Net income (loss) on discontinued operations	(314,903)	(66,232)	(346,084)	(184,278)
Net income (loss)	$ (74,030)	$ 237,775	$ 574,845	$ 6,403
Denominator:
For basic net income (loss) per share - weighted average common shares outstanding (in shares)	5,009,041	4,700,422	5,000,185	4,633,621
Effect of dilutive stock options (in shares)	0	0	0	0
For diluted net income (loss) per share - weighted average common shares outstanding (in shares)	5,009,041	4,700,422	5,000,185	4,633,621
Net Income (loss) per share - Basic:
Continuing Operations, basic (in dollars per share)	$ 0.05	$ 0.06	$ 0.18	$ 0.04
Discontinued Operations, basic (in dollars per share)	(0.06)	(0.01)	(0.07)	(0.04)
Net income (loss) per share, basic (in dollars per share)	(0.01)	0.05	0.11	0.00
Net Income (loss) per share - Diluted:
Continuing Operations, diluted (in dollars per share)	0.05	0.06	0.18	0.04
Discontinued Operations, diluted (in dollars per share)	(0.06)	(0.01)	(0.07)	(0.04)
Net income (loss) per share, diluted (in dollars per share)	$ (0.01)	$ 0.05	$ 0.11	$ 0.00