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Stock options (Tables) | 12 Months Ended
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Oct. 31, 2017
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 2017 and 2016 was estimated on the grant date using the Black-Scholes option pricing model with the following assumptions:
|  | 2017 |  |  | 2016 |
Weighted average volatility |  |  | 43.3 | % |  |  | 28.7 | %
Expected dividends |  |  | 5.0 | % |  |  | 2.4 | %
Expected term (in years) |  |  | 4.3 |  |  |  | 3.0 |
Risk-free interest rate |  |  | 1.20 | % |  |  | 0.70 | %
Weighted average fair value of options granted during the year |  | $ | 0.39 |  |  | $ | 0.66 |
Weighted average fair value of options vested during the year |  | $ | 1.95 |  |  | $ | 4.36 |
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, 2017 and 2016 and changes in outstanding stock options in 2017 and 2016 follows:
|  | 2017 |  | 2016 |
|  | Shares or |  | Weighted |  | Shares or |  | Weighted |
|  | Price Per |  | Average |  | Price Per |  | Average |
|  | Share |  | Exercise Price |  | Share |  | Exercise Price |
Options outstanding at beginning of year |  |  | 1,007,851 |  | $ | 4.07 |  |  | 1,240,100 |  | $ | 3.64 |
Options granted |  |  | 449,068 |  | $ | 1.61 |  |  | 104,936 |  | $ | 3.36 |
Options exercised |  |  | (36,763) |  | $ | 1.50 |  |  | (180,067) |  | $ | 0.27 |
Options forfeited |  |  | (260,385) |  | $ | 4.10 |  |  | (157,118) |  | $ | 4.53 |
Options outstanding at end of year |  |  | 1,159,771 |  | $ | 3.19 |  |  | 1,007,851 |  | $ | 4.07 |
Options exercisable at end of year |  |  | 926,272 |  | $ | 3.08 |  |  | 724,457 |  | $ | 3.93 |
Options vested and expected to vest at end of year |  |  | 1,159,002 |  | $ | 3.19 |  |  | 1,002,522 |  | $ | 4.07 |
Option price range at end of year |  | $ | 1.07 - $6.91 |  |  |  |  | $ | 2.30 - $6.91 |  |  |  |
Aggregate intrinsic value of options exercised during year |  | $ | 55,000 |  |  |  |  | $ | 456,000 |  |  |  |

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: 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=96867065&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=96867065&loc=d3e5070-113901 + Details
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