Note 15 - Stock-based Compensation (Tables)
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12 Months Ended |
Oct. 31, 2019 |
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| Notes Tables |
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| Share-based Payment Arrangement, Activity [Table Text Block] |
| | | | | | | | Fair Value of Awards Per Share | | | Total Fair Value of Awards | | Date Expense will be Recognized Through (Straight-Line Basis) | | U.S. | | | | | 1,156,630 | | | $ | 6.67 | | | $ | 7,714,722 | | | | U.S. | | | | | 1,543,044 | | | $ | 4.47 | | | $ | 6,904,032 | | | | U.S. | | | | | 1,543,044 | | | $ | 3.85 | | | $ | 5,940,038 | | | | U.S. | | | | | 1,543,091 | | | $ | 3.34 | | | $ | 5,149,194 | | | | U.S. | | | | | 25,000 | | | $ | 4.05 | | | $ | 101,250 | | | | U.S. | | | | | 25,000 | | | $ | 2.72 | | | $ | 67,919 | | | | U.S. | | | | | 25,000 | | | $ | 2.34 | | | $ | 58,436 | | | | U.S. | | | | | 25,000 | | | $ | 2.03 | | | $ | 50,654 | | | | U.K. | | | | | 164,744 | | | $ | 6.67 | | | $ | 1,098,842 | | | | U.K. | | | | | 238,808 | | | $ | 4.46 | | | $ | 1,066,272 | | | | U.K. | | | | | 238,808 | | | $ | 3.84 | | | $ | 917,096 | | | | U.K. | | | | | 238,833 | | | $ | 3.33 | | | $ | 794,772 | | | | | | | 6,767,002 | | | | | | | $ | 29,863,227 | | | |
| Share-based Payment Arrangement, Option, Activity [Table Text Block] |
| | | | | | Weighted average exercise price | | | Outstanding stock options, December 6, 2018 | | | 2,783,479 | | | $ | 1.48 | | | Granted | | | 881,193 | | | $ | 0.01 | | | Forfeited | | | (22,250 | ) | | $ | 0.01 | | | Exercised | | | (1,573,024 | ) | | $ | 0.87 | | | Expired | | | - | | | $ | - | | | Outstanding stock options, October 31, 2019 | | | 2,069,398 | | | $ | 1.33 | | |
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding and Exercisable [Table Text Block] |
| | | | | | | | | | | | | | | | | Weighted average exercise price | | | Weighted average remaining contractual life (yrs) | | | Aggregate Intrinsic Value | | | | | | Weighted average exercise price | | | Weighted average remaining contractual life (yrs) | | | Aggregate Intrinsic Value | | | $ | 0.01 | | | | 858,943 | | | $ | 0.01 | | | | 9.4 | | | $ | 2,946 | | | | - | | | $ | - | | | | n/a | | | $ | - | | | $ | 0.87 | | | | 886,382 | | | $ | 0.87 | | | | 5.3 | | | | 2,278 | | | | 886,382 | | | $ | 0.87 | | | | 5.3 | | | | 2,278 | | | $ | 6.09 | | | | 324,073 | | | $ | 6.09 | | | | 6.4 | | | | - | | | | 324,073 | | | $ | 6.09 | | | | 6.4 | | | | - | | | | | | | 2,069,398 | | | $ | 1.33 | | | | 7.2 | | | $ | 5,224 | | | | 1,210,455 | | | $ | 2.27 | | | | 5.6 | | | $ | 2,278 | | |
| Nonvested Restricted Stock Shares Activity [Table Text Block] |
| | | | | | Weighted average grant-date fair value | | | Unvested as of December 6, 2018 | | | - | | | $ | - | | | Granted | | | 5,885,809 | | | $ | 4.42 | | | Vested | | | - | | | $ | - | | | Forfeited | | | (130,350 | ) | | $ | 4.58 | | | Unvested as of October 31, 2019 | | | 5,755,459 | | | $ | 4.44 | | |