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, 2021	Aug. 31, 2020	Aug. 31, 2021	Aug. 31, 2020
Numerator for basic and diluted net income (loss) per share:
Net income (loss)	$ 56,456	$ (423,611)	$ (194,692)	$ (1,662,523)
Denominator:
For basic net income (loss) per share - weighted average common shares outstanding (in shares)	4,529,026	4,426,850	4,508,986	4,381,686
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)	4,529,026	4,426,850	4,508,986	4,381,686
Net Income (Loss) per share - Basic:
Net Income (Loss) per share (in dollars per share)	$ 0.01	$ (0.10)	$ (0.04)	$ (0.38)
Net Income (Loss) per share - Diluted:
Net Income (Loss) per share (in dollars per share)	$ 0.01	$ (0.10)	$ (0.04)	$ (0.38)