Note 5 - 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, 2022	Aug. 31, 2021	Aug. 31, 2022	Aug. 31, 2021
Numerator for basic and diluted net income (loss) per share:
Net income (loss)	$ 237,775	$ 56,456	$ 6,403	$ (194,692)
Denominator:
For basic net income (loss) per share - weighted average common shares outstanding (in shares)	4,700,422	4,529,026	4,633,621	4,508,986
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)	4,700,422	4,529,026	4,633,621	4,508,986
Net Income (Loss) per share - Basic:
Net Income (Loss) per share (in dollars per share)	$ 0.05	$ 0.01	$ 0.00	$ (0.04)
Net Income (Loss) per share - Diluted:
Net Income (Loss) per share (in dollars per share)	$ 0.05	$ 0.01	$ 0.00	$ (0.04)