Note 7 - 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, 2025	Aug. 31, 2024	Aug. 31, 2025	Aug. 31, 2024
Numerator for basic and diluted net income (loss) per share:
Net income (loss) from continuing operations	$ 254,110	$ 2,230	$ 1,680,423	$ (426,657)
Net income (loss) on discontinued operations	0	(28,430)	0	(97,895)
Net income (loss)	$ 254,110	$ (26,200)	$ 1,680,423	$ (524,552)
Denominator:
For basic net income (loss) per share - weighted average common shares outstanding (in shares)	5,106,033	5,071,512	5,085,183	5,054,092
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)	5,106,033	5,071,512	5,085,183	5,054,092
Net Income (loss) per share - Basic:
Continuing Operations, basic (in dollars per share)	$ 0.05	$ 0	$ 0.33	$ (0.08)
Discontinued Operations, basic (in dollars per share)	0	(0.01)	0	(0.02)
Net income (loss) per share (in dollars per share)	0.05	(0.01)	0.33	(0.1)
Net Income (loss) per share - Diluted:
Continuing Operations, diluted (in dollars per share)	0.05	0	0.33	(0.08)
Discontinued Operations, diluted (in dollars per share)	0	(0.01)	0	(0.02)
Net income (loss) per share (in dollars per share)	$ 0.05	$ (0.01)	$ 0.33	$ (0.1)