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Business activities and summary of significant accounting policies - Computation of Basic and Diluted Weighted Average Shares Outstanding (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Oct. 31, 2019	Oct. 31, 2018
Numerators:
Consolidated net income (A)	$ 3,521	$ 5,846
Denominators:
Weighted average shares outstanding for basic earnings per share (B)	9,358,836	9,105,406
Add effects of potentially dilutive securities - assumed exercise of stock options	495,768	487,660
Weighted average shares outstanding for diluted earnings per share (C)	9,854,604	9,593,066
Basic earnings per share (A)/(B)	$ 0.38	$ 0.64
Diluted earnings per share (A)/(C)	$ 0.36	$ 0.61

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