Note 4 - 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, 2018	Aug. 31, 2017	Aug. 31, 2018	Aug. 31, 2017
Numerator for basic and diluted net (loss) income per share of common stock:
Net (loss) income from continuing operations	$ (766,716)	$ 41,648	$ (1,948,093)	$ (720,900)
Net (loss) income from discontinued operations		(18,441)	(50,853)	(33,482)
Net (loss) income	$ (766,716)	$ 23,207	$ (1,998,946)	$ (754,382)
Denominator:
For basic net (loss) income per share - weighted average shares of common stock outstanding (in shares)	4,209,445	4,161,421	4,198,250	4,148,966
Effect of dilutive stock options (in shares)
For diluted net (loss) income per share - weighted average shares of common stock outstanding (in shares)	4,209,445	4,161,421	4,198,250	4,148,966
Net income (loss) per share - Basic:
Continuing operations (in dollars per share)	$ (0.18)	$ 0.01	$ (0.46)	$ (0.17)
Discontinued operations (in dollars per share)			(0.01)	(0.01)
Net income (loss) per share (in dollars per share)	(0.18)	0.01	(0.47)	(0.18)
Net income (loss) per share - Diluted:
Continuing operations (in dollars per share)	(0.18)	0.01	(0.46)	(0.17)
Discontinued operations (in dollars per share)			(0.01)	(0.01)
Net income (loss) per share (in dollars per share)	$ (0.18)	$ 0.01	$ (0.47)	$ (0.18)