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, 2020	Aug. 31, 2019	Aug. 31, 2020	Aug. 31, 2019
Numerator for basic and diluted net income (loss) per share:
Net income (loss)	$ (423,611)	$ (289,216)	$ (1,662,523)	$ (1,251,190)
Denominator:
For basic net income (loss) per share - weighted average common shares outstanding (in shares)	4,426,850	4,309,587	4,381,686	4,285,335
Effect of dilutive stock options (in shares)
For diluted net income (loss) per share - weighted average common shares outstanding (in shares)	4,426,850	4,309,587	4,381,686	4,285,335
Net Income (Loss) per share - Basic:
Net Income (Loss) per share (in dollars per share)	$ (0.10)	$ (0.07)	$ (0.38)	$ (0.29)
Net Income (Loss) per share - Diluted:
Net Income (Loss) per share (in dollars per share)	$ (0.10)	$ (0.07)	$ (0.38)	$ (0.29)