Calculation of basic and diluted earnings per share (Detail) (USD $)	12 Months Ended
	Oct. 31, 2012	Oct. 31, 2011
Numerators:
Consolidated net income (A)	$ 2,612,422	$ 773,011
Denominators:
Weighted average shares outstanding for basic earnings per share (B)	6,908,890	6,382,845
Add effects of potentially dilutive securities - assumed exercise of stock options	771,853	909,003
Weighted average shares for diluted earnings per share (C)	7,680,743	7,291,848
Basic net earnings per share (A)(B)	$ 0.38	$ 0.12
Diluted net earnings per share (A)(C)	$ 0.34	$ 0.11