Note 5 - 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, 2020	May 31, 2019	May 31, 2020	May 31, 2019
Numerator for basic and diluted net income (loss) per share:
Net income (loss)	$ (801,720)	$ (356,042)	$ (1,238,913)	$ (961,974)
Denominator:
For basic net income (loss) per share - weighted average common shares outstanding (in shares)	4,401,754	4,299,289	4,358,982	4,272,532
Effect of dilutive stock options (in shares)
For diluted net income (loss) per share - weighted average common shares outstanding (in shares)	4,401,754	4,299,289	4,358,982	4,272,532
Net Income (Loss) per share - Basic:
Net Income (Loss) per share (in dollars per share)	$ (0.18)	$ (0.08)	$ (0.28)	$ (0.23)
Net Income (Loss) per share - Diluted:
Net Income (Loss) per share (in dollars per share)	$ (0.18)	$ (0.08)	$ (0.28)	$ (0.23)