Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($)	Feb. 28, 2019	Nov. 30, 2018
Allowance for doubtful accounts	$ 33,530	$ 25,100
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)	4,296,703	4,225,050
Treasury stock (in shares)	14,779	9,286

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.

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