Note 5 - Net Income (Loss) Per Share of Common Stock - Basic and Diluted Earnings Per Common Share (Details) - USD ($)	3 Months Ended
	Feb. 28, 2021	Feb. 29, 2020
Numerator for basic and diluted net income (loss) per share:
Net income (loss)	$ (315,238)	$ (437,192)
Denominator:
For basic net income (loss) per share - weighted average common shares outstanding (in shares)	4,475,279	4,315,481
Effect of dilutive stock options (in shares)
For diluted net income (loss) per share - weighted average common shares outstanding (in shares)	4,475,279	4,315,481
Net Income (Loss) per share - Basic:
Net Income (Loss) per share (in dollars per share)	$ (0.07)	$ (0.10)
Net Income (Loss) per share - Diluted:
Net Income (Loss) per share (in dollars per share)	$ (0.07)	$ (0.10)