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Stock-based compensation and equity transactions (Tables) | 9 Months Ended
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Jul. 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 weighted average fair value of employee and non-employee directors’ stock options granted by the Company during the nine months ended July 31, 2016 and 2015 was estimated to be $3.36 and $1.08, respectively, per share, using the Black-Scholes option pricing model with the following assumptions:
|  | 2016 |  | 2015 |
Risk-free interest rate |  |  | 0.70 | % |  | 1.15 | %
Dividend yield |  |  | 2.38 | % |  | 6.68 | %
Expected life of the option |  |  | 3.0 years |  |  | 5.3 years |
Volatility factor |  |  | 28.7 | % |  | 52.3 | %
Summary of Status of Options Granted under Stock Option Plans and Changes in Options Outstanding | A summary of the status of the options granted under the Company’s stock option plans as of July 31, 2016 and the changes in options outstanding during the nine months then ended is presented in the table that follows:
|  |  |  |  | Weighted |
|  |  |  |  | Average |
|  | Shares |  | Exercise Price |
Outstanding at November 1, 2015 |  |  | 1,240,100 |  | $ | 3.64 |
Options granted |  |  | 104,936 |  | $ | 3.36 |
Options exercised |  |  | (180,067) |  | $ | 0.27 |
Options canceled or expired |  |  | (71,118) |  | $ | 4.52 |
Options outstanding at July 31, 2016 |  |  | 1,093,851 |  | $ | 4.11 |
Options exercisable at July 31, 2016 |  |  | 634,598 |  | $ | 3.83 |
Options vested and expected to vest at July 31, 2016 |  |  | 1,087,360 |  | $ | 4.11 |

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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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