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, 2019	Aug. 31, 2018	Aug. 31, 2019	Aug. 31, 2018
Numerator for basic and diluted net income (loss) per share:
Net (loss) from continuing operations	$ (289,216)	$ (766,716)	$ (1,251,190)	$ (1,948,093)
Net (loss) from discontinued operations				(50,853)
Net income (loss)	$ (289,216)	$ (766,716)	$ (1,251,190)	$ (1,998,946)
Denominator:
For basic net income (loss) per share - weighted average common shares outstanding (in shares)	4,309,587	4,209,445	4,285,535	4,198,250
Effect of dilutive stock options (in shares)
For diluted net income (loss) per share - weighted average common shares outstanding (in shares)	4,309,587	4,209,445	4,285,535	4,198,250
Net Income (Loss) per share - Basic:
Continuing Operations (in dollars per share)	$ (0.07)	$ (0.18)	$ (0.29)	$ (0.46)
Discontinued Operations (in dollars per share)				(0.01)
Net Income (Loss) per share (in dollars per share)	(0.07)	(0.18)	(0.29)	(0.47)
Net Income (Loss) per share - Diluted:
Continuing Operations (in dollars per share)	(0.07)	(0.18)	(0.29)	(0.46)
Discontinued Operations (in dollars per share)				(0.01)
Net Income (Loss) per share (in dollars per share)	$ (0.07)	$ (0.18)	$ (0.29)	$ (0.47)