Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($)	Aug. 31, 2017	Nov. 30, 2016
Allowance for doubtful accounts	$ 36,642	$ 22,746
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, authorized (in shares)	500,000	500,000
Preferred stock, issued (in shares)	0	0
Preferred stock, outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, authorized (in shares)	9,500,000	9,500,000
Common stock, issued (in shares)	4,158,752	4,109,052
Common stock, outstanding (in shares)	4,158,752	4,109,052
Treasury stock (in shares)	1,838	0

A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Section S99
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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