Note 3 - 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, 2015	Aug. 31, 2014	Aug. 31, 2015	Aug. 31, 2014
Basic:
Numerator: net income (loss)	$ (795,593)	$ 558,208	$ (395,770)	$ 553,051
Denominator: average number of common shares outstanding (in shares)	4,061,052	4,048,552	4,057,496	4,047,544
Basic earnings (loss) per common share (in dollars per share)	$ (0.20)	$ 0.14	$ (0.10)	$ 0.14
Diluted:
Numerator: net income (loss)	$ (795,593)	$ 558,208	$ (395,770)	$ 553,051
Average number of common shares outstanding (in shares)	4,061,052	4,048,552	4,057,496	4,047,544
Effect of dilutive stock options (in shares)	0	4,577	0	5,608
Denominator: dilutive average number of common shares outstanding (in shares)	4,061,052	4,053,129	4,057,496	4,053,152
Diluted earnings (loss) per common share (in dollars per share)	$ (0.20)	$ 0.14	$ (0.10)	$ 0.14