Consolidated Balance Sheets (Parentheticals) - USD ($)	Nov. 30, 2016	Nov. 30, 2015
Allowance for doubtful accounts	$ 22,746	$ 18,810
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)	4,109,052	4,061,052
Common stock, outstanding (in shares)	4,109,052	4,061,052