Note 5 - Net Income (Loss) Per Share of Common Stock - Basic and Diluted Earnings Per Common Share (Details) - USD ($)	3 Months Ended		6 Months Ended
	May 31, 2022	May 31, 2021	May 31, 2022	May 31, 2021
Numerator for basic and diluted net income (loss) per share:
Net income (loss)	$ 175,353	$ 64,090	$ (231,136)	$ (251,148)
Denominator:
Net income (loss)	$ 175,353	$ 64,090	$ (231,136)	$ (251,148)
For basic net income (loss) per share - weighted average common shares outstanding (in shares)	4,629,331	4,522,514	4,599,743	4,498,687
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)	4,629,331	4,522,514	4,599,743	4,498,687
Net Income (Loss) per share - Basic:
For diluted net income (loss) per share - weighted average common shares outstanding (in shares)	4,629,331	4,522,514	4,599,743	4,498,687
Net Income (Loss) per share (in dollars per share)	$ 0.04	$ 0.01	$ (0.05)	$ (0.06)
Net Income (Loss) per share - Diluted:
Net Income (Loss) per share (in dollars per share)	0.04	0.01	(0.05)	(0.06)
Net Income (Loss) per share (in dollars per share)	$ 0.04	$ 0.01	$ (0.05)	$ (0.06)