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Note 15 - Stock Plans (Tables) | 12 Months Ended
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Oct. 31, 2018
Notes Tables |
Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  | October 31, 2018 |  |  | Weighted-Average Exercise Price |  |  | October 31, 2017 |  |  | Weighted-Average Exercise Price |  |  | October 31, 2016 |  |  | Weighted-Average Exercise Price |
Options outstanding at beginning of period |  |  | 6,860,701 |  |  | $ | 3.40 |  |  |  | 7,373,951 |  |  | $ | 4.03 |  |  |  | 6,393,876 |  |  | $ | 4.78 |
Granted |  |  | 945,625 |  |  | $ | 2.25 |  |  |  | 236,250 |  |  | $ | 2.34 |  |  |  | 1,148,481 |  |  | $ | 1.95 |
Exercised |  |  | 30,250 |  |  | $ | 2.00 |  |  |  | 48,250 |  |  | $ | 2.07 |  |  |  | - |  |  | $ | - |
Forfeited |  |  | 50,000 |  |  | $ | 2.57 |  |  |  | 452,375 |  |  | $ | 5.85 |  |  |  | 51,125 |  |  | $ | 2.73 |
Expired |  |  | 761,750 |  |  | $ | 6.28 |  |  |  | 248,875 |  |  | $ | 16.68 |  |  |  | 117,281 |  |  | $ | 25.05 |
Options outstanding at end of period |  |  | 6,964,326 |  |  | $ | 2.95 |  |  |  | 6,860,701 |  |  | $ | 3.40 |  |  |  | 7,373,951 |  |  | $ | 4.03 |
Options exercisable at end of period |  |  | 4,793,490 |  |  |  |  |  |  |  | 5,259,011 |  |  |  |  |  |  |  | 5,071,181 |  |  |  |  |
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] |
|  |  |  |  | Number |  |  | Weighted- Average |  |  | Weighted- Average Remaining Contractual |
Range of Exercise Prices |  |  | Outstanding |  |  | Exercise Price |  |  | Life |
$1.54 | – | $2.41 |  |  |  | 2,645,784 |  |  | $ | 2.00 |  |  |  | 6.32 |
$2.42 | – | $4.41 |  |  |  | 3,004,042 |  |  | $ | 2.77 |  |  |  | 3.57 |
$4.42 | – | $6.28 |  |  |  | 1,314,500 |  |  | $ | 5.27 |  |  |  | 2.66 |
|  |  |  |  |  | 6,964,326 |  |  | $ | 2.95 |  |  |  | 4.44 |
|  |  |  |  | Number |  |  | Weighted- Average |  |  | Weighted- Average Remaining Contractual |
Range of Exercise Prices |  |  | Exercisable |  |  | Exercise Price |  |  | Life |
$1.54 | – | $2.41 |  |  |  | 1,108,534 |  |  | $ | 1.97 |  |  |  | 3.65 |
$2.42 | – | $4.41 |  |  |  | 2,370,456 |  |  | $ | 2.81 |  |  |  | 2.09 |
$4.42 | – | $6.28 |  |  |  | 1,314,500 |  |  | $ | 5.27 |  |  |  | 2.66 |
|  |  |  |  |  | 4,793,490 |  |  | $ | 3.29 |  |  |  | 2.61 |
Schedule of Nonvested Share Activity [Table Text Block] |
|  | Shares |  |  | Weighted-Average Grant Date Fair Value |
Nonvested at beginning of period |  |  | 6,174,477 |  |  | $ | 2.36 |
Granted |  |  | 2,129,073 |  |  | $ | 2.55 |
Vested |  |  | 705,144 |  |  | $ | 2.31 |
Forfeited |  |  | 2,423,148 |  |  | $ | 1.98 |
Nonvested at end of period |  |  | 5,175,258 |  |  | $ | 2.62 |

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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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