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Note 15 - Stock Plans (Tables) | 12 Months Ended
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Oct. 31, 2020
Notes Tables |
Share-based Payment Arrangement, Option, Activity [Table Text Block] |
|  | October 31, |  |  | Weighted-Average |  |  | October 31, |  |  | Weighted-Average |  |  | October 31, |  |  | Weighted-Average |
|  | 2020 |  |  | Exercise Price |  |  | 2019 |  |  | Exercise Price |  |  | 2018 |  |  | Exercise Price |
Options outstanding at beginning of period |  |  | 331,481 |  |  | $ | 53.93 |  |  |  | 278,569 |  |  | $ | 73.76 |  |  |  | 274,423 |  |  | $ | 85.22 |
Granted |  |  | - |  |  | $ | - |  |  |  | 110,975 |  |  | $ | 9.44 |  |  |  | 37,825 |  |  | $ | 56.30 |
Exercised |  |  | - |  |  | $ | - |  |  |  | - |  |  | $ | - |  |  |  | 1,210 |  |  | $ | 49.91 |
Forfeited |  |  | 6,560 |  |  | $ | 26.24 |  |  |  | 2,038 |  |  | $ | 53.96 |  |  |  | 2,000 |  |  | $ | 64.25 |
Expired |  |  | 35,530 |  |  | $ | 115.28 |  |  |  | 56,025 |  |  | $ | 64.41 |  |  |  | 30,469 |  |  | $ | 156.95 |
Options outstanding at end of period |  |  | 289,391 |  |  | $ | 47.02 |  |  |  | 331,481 |  |  | $ | 53.93 |  |  |  | 278,569 |  |  | $ | 73.76 |
Options exercisable at end of period |  |  | 145,553 |  |  |  |  |  |  |  | 147,019 |  |  |  |  |  |  |  | 191,748 |  |  |  |  |
Share-based Payment Arrangement, Option, Exercise Price Range [Table Text Block] |
|  |  |  |  |  |  |  |  |  | Weighted- |
|  |  |  |  |  |  |  |  |  | Average |
|  |  |  |  |  | Weighted- |  |  | Remaining |
|  | Number |  |  | Average |  |  | Contractual |
Range of Exercise Prices |  | Outstanding |  |  | Exercise Price |  |  | Life |
$7.85 – $38.50 |  |  | 108,150 |  |  | $ | 9.65 |  |  |  | 8.58 |
$38.75 – $58.13 |  |  | 96,995 |  |  | $ | 50.07 |  |  |  | 3.76 |
$61.00 – $90.38 |  |  | 57,300 |  |  | $ | 67.66 |  |  |  | 4.11 |
$118.25 – $157.00 |  |  | 26,946 |  |  | $ | 142.17 |  |  |  | 2.76 |
|  |  | 289,391 |  |  | $ | 47.02 |  |  |  | 5.54 |
|  |  |  |  |  |  |  |  |  | Weighted- |
|  |  |  |  |  |  |  |  |  | Average |
|  |  |  |  |  | Weighted- |  |  | Remaining |
|  | Number |  |  | Average |  |  | Contractual |
Range of Exercise Prices |  | Exercisable |  |  | Exercise Price |  |  | Life |
$7.85 – $38.50 |  |  | 850 |  |  | $ | 24.08 |  |  |  | 3.25 |
$38.75 – $58.13 |  |  | 82,557 |  |  | $ | 50.31 |  |  |  | 3.2 |
$61.00 – $90.38 |  |  | 35,200 |  |  | $ | 71.46 |  |  |  | 1.95 |
$118.25 – $157.00 |  |  | 26,946 |  |  | $ | 142.17 |  |  |  | 2.76 |
|  |  | 145,553 |  |  | $ | 72.28 |  |  |  | 2.81 |
Schedule of Nonvested Share Activity [Table Text Block] |
|  | October 31, |  |  | Weighted-Average Grant Date |  |  | October 31, |  |  | Weighted-Average Grant Date |  |  | October 31, |  |  | Weighted-Average Grant Date |
|  | 2020 |  |  | Fair Value |  |  | 2019 |  |  | Fair Value |  |  | 2018 |  |  | Fair Value |
Nonvested Time-Based at beginning of period |  |  | 231,210 |  |  | $ | 23.01 |  |  |  | 105,594 |  |  | $ | 61.77 |  |  |  | 96,091 |  |  | $ | 60.50 |
Granted |  |  | 142,231 |  |  | $ | 19.48 |  |  |  | 164,050 |  |  | $ | 7.66 |  |  |  | 37,888 |  |  | $ | 54.95 |
Vested |  |  | 62,309 |  |  | $ | 17.04 |  |  |  | 21,329 |  |  | $ | 45.52 |  |  |  | 22,821 |  |  | $ | 55.19 |
Forfeited |  |  | 22,267 |  |  | $ | 57.81 |  |  |  | 17,106 |  |  | $ | 86.96 |  |  |  | 5,564 |  |  | $ | 20.87 |
Nonvested Time-Based at end of period |  |  | 288,865 |  |  | $ | 19.88 |  |  |  | 231,210 |  |  | $ | 23.01 |  |  |  | 105,594 |  |  | $ | 61.77 |
|  | October 31, |  |  | Weighted-Average Grant Date |  |  | October 31, |  |  | Weighted-Average Grant Date |  |  | October 31, |  |  | Weighted-Average Grant Date |
|  | 2020 |  |  | Fair Value |  |  | 2019 |  |  | Fair Value |  |  | 2018 |  |  | Fair Value |
Nonvested Performance-Based at beginning of period |  |  | 136,316 |  |  | $ | 44.22 |  |  |  | 101,407 |  |  | $ | 69.28 |  |  |  | 150,881 |  |  | $ | 50.26 |
Granted |  |  | 183,825 |  |  | $ | 15.11 |  |  |  | 56,400 |  |  | $ | 10.10 |  |  |  | 47,277 |  |  | $ | 70.41 |
Vested |  |  | 4,284 |  |  | $ | 57.22 |  |  |  | 8,655 |  |  | $ | 42.69 |  |  |  | 5,390 |  |  | $ | 72.52 |
Forfeited |  |  | 21,385 |  |  | $ | 70.44 |  |  |  | 12,836 |  |  | $ | 93.31 |  |  |  | 91,361 |  |  | $ | 38.27 |
Nonvested Performance-Based at end of period |  |  | 294,472 |  |  | $ | 24.64 |  |  |  | 136,316 |  |  | $ | 44.22 |  |  |  | 101,407 |  |  | $ | 69.28 |

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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=120381028&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=120381028&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=120381028&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=120381028&loc=d3e5070-113901 + Details
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