Note 4 - Net Income (Loss) Per Share of Common Stock - Basic and Diluted Earnings Per Common Share (Details) - USD ($)	3 Months Ended		6 Months Ended
	May 31, 2017	May 31, 2016	May 31, 2017	May 31, 2016
Denominator:
For basic (loss) earnings per share - weighted average common shares outstanding (in shares)	4,158,969	4,101,810	4,142,672	4,088,073
Effect of dilutive stock options (in shares)
For diluted (loss) earnings per share - weighted average common shares outstanding (in shares)	4,158,969	4,101,810	4,142,672	4,088,073
Earnings (Loss) per share - Basic:
Continuing Operations (in dollars per share)	$ (0.12)	$ 0	$ (0.18)	$ 0.04
Discontinued Operations (in dollars per share)	0	(0.02)	0	(0.03)
Net Income (Loss) per share (in dollars per share)	(0.12)	(0.02)	(0.18)	0.01
Earnings (Loss) per share - Diluted:
Continuing Operations (in dollars per share)	(0.12)	0	(0.18)	0.04
Discontinued Operations (in dollars per share)	0	(0.02)	0	(0.03)
Net Income (Loss) per share (in dollars per share)	$ (0.12)	$ (0.02)	$ (0.18)	$ 0.01
Numerator for basic and diluted (loss) earnings per common share:
Net (loss) income from continuing operations	$ (508,907)	$ 16,925	$ (762,547)	$ 150,485
Net (loss) income from discontinued operations	(18,653)	(73,496)	(15,041)	(126,084)
Net (loss) income	$ (527,560)	$ (56,571)	$ (777,588)	$ 24,401