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, 2017	Aug. 31, 2016	Aug. 31, 2017	Aug. 31, 2016
Numerator for basic and diluted (loss) earnings per common share:
Net (loss) income from continuing operations	$ 41,648	$ (149,676)	$ (720,900)	$ 807
Net (loss) income from discontinued operations	(18,441)	(138,603)	(33,482)	(264,685)
Net (loss) income	$ 23,207	$ (288,279)	$ (754,382)	$ (263,878)
Denominator:
Effect of dilutive stock options (in shares)
For diluted (loss) earnings per share - weighted average common shares outstanding (in shares)	4,161,421	4,105,704	4,148,966	4,093,993
For basic (loss) earnings per share - weighted average common shares outstanding (in shares)	4,161,421	4,105,704	4,148,966	4,093,993
Earnings (Loss) per share - Basic:
Discontinued Operations (in dollars per share)		$ (0.03)	$ (0.01)	$ (0.06)
Net Income (Loss) per share (in dollars per share)	0.01	(0.07)	(0.18)	(0.06)
Continuing Operations (in dollars per share)	0.01	(0.04)	(0.17)	0
Earnings (Loss) per share - Diluted:
Discontinued Operations (in dollars per share)		(0.03)	(0.01)	(0.06)
Net Income (Loss) per share (in dollars per share)	0.01	(0.07)	(0.18)	(0.06)
Continuing Operations (in dollars per share)	$ 0.01	$ (0.04)	$ (0.17)	$ 0