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Stock options (Tables) | 12 Months Ended
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Oct. 31, 2016
Disclosure Of Compensation Related Costs, Share-Based Payments [Abstract] |
Computation of Weighted Average Fair Value of Employee Stock Options using Black-Scholes Option Pricing Model Assumptions | The fair value of each option granted in 2016 and 2015 was estimated on the grant date using the Black-Scholes option pricing model with the following assumptions:
|  | 2016 |  |  | 2015 |
Weighted average volatility |  |  | 28.7 | % |  |  | 52.2 | %
Expected dividends |  |  | 2.4 | % |  |  | 6.7 | %
Expected term (in years) |  |  | 3.0 |  |  |  | 5.4 |
Risk-free interest rate |  |  | 0.70 | % |  |  | 1.17 | %
Weighted average fair value of options granted during the year |  | $ | 0.66 |  |  | $ | 1.09 |
Weighted average fair value of options vested during the year |  | $ | 4.36 |  |  | $ | 4.78 |
Summary of Status of Options Granted under Stock Option Plans and Changes in Options Outstanding | Additional information regarding all of the Company's outstanding stock options at October 31, 2016 and 2015 and changes in outstanding stock options in 2016 and 2015 follows:
|  | 2016 |  | 2015 |
|  | Shares or |  | Weighted |  | Shares or |  | Weighted |
|  | Price Per |  | Average |  | Price Per |  | Average |
|  | Share |  | Exercise Price |  | Share |  | Exercise Price |
Options outstanding at beginning of year |  |  | 1,240,100 |  | $ | 3.64 |  |  | 1,044,932 |  | $ | 3.27 |
Options granted |  |  | 104,936 |  | $ | 3.36 |  |  | 396,039 |  | $ | 4.21 |
Options exercised |  |  | (180,067) |  | $ | 0.27 |  |  | (153,837) |  | $ | 2.12 |
Options forfeited |  |  | (157,118) |  | $ | 4.53 |  |  | (47,034) |  | $ | 5.11 |
Options outstanding at end of year |  |  | 1,007,851 |  | $ | 4.07 |  |  | 1,240,100 |  | $ | 3.27 |
Options exercisable at end of year |  |  | 724,457 |  | $ | 3.93 |  |  | 782,648 |  | $ | 3.02 |
Options vested and expected to vest at end of year |  |  | 1,002,522 |  | $ | 4.07 |  |  | 1,233,543 |  | $ | 3.63 |
Option price range at end of year |  | $ | 2.30 - $6.91 |  |  |  |  | $ | 0.05 - $6.91 |  |  |  |
Aggregate intrinsic value of options exercised during year |  | $ | 456,000 |  |  |  |  | $ | 363,000 |  |  |  |

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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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