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Note 15 - Income Taxes (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 30, 2019 | Oct. 31, 2018 | Apr. 30, 2018 | Jul. 31, 2017 | Apr. 30, 2019 | Apr. 30, 2018 | Oct. 31, 2018
Income Tax Expense (Benefit), Total | $ 345 |  | $ 245 |  | $ 691 | $ 583 |
Deferred Tax Assets, Valuation Allowance, Total | 642,900 |  |  |  | 642,900 |  |
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest, Total | (14,912) | $ 48,100 | (9,578) | $ (50,200) | (32,018) | (40,049) | $ 8,100
Gain (Loss) on Extinguishment of Debt, Total |  |  | (1,440) | $ (42,300) |  | (1,440) |
Domestic Tax Authority [Member] |  |  |  |  |  |  |
Income Tax Expense (Benefit), Total |  |  |  |  |  |  |
Domestic Tax Authority [Member] | Between 2028 and 2037 [Member] |  |  |  |  |  |  |
Operating Loss Carryforwards, Total | 1,600,000 |  |  |  | 1,600,000 |  |
Domestic Tax Authority [Member] | Indefinite Tax Period [Member] |  |  |  |  |  |  |
Operating Loss Carryforwards, Total | 41,900 |  |  |  | 41,900 |  |
State and Local Jurisdiction [Member] |  |  |  |  |  |  |
Income Tax Expense (Benefit), Total | 345 |  | $ 245 |  | 691 | $ 583 |
State and Local Jurisdiction [Member] | Indefinite Tax Period [Member] |  |  |  |  |  |  |
Operating Loss Carryforwards, Total | 43,200 |  |  |  | 43,200 |  |
State and Local Jurisdiction [Member] | Between 2019 and 2038 [Member] |  |  |  |  |  |  |
Operating Loss Carryforwards, Total | 2,500,000 |  |  |  | 2,500,000 |  |
State and Local Jurisdiction [Member] | Between 2019 and 2023 [Member] |  |  |  |  |  |  |
Operating Loss Carryforwards, Total | 145,300 |  |  |  | 145,300 |  |
State and Local Jurisdiction [Member] | Between 2024 and 2028 [Member] |  |  |  |  |  |  |
Operating Loss Carryforwards, Total | 691,200 |  |  |  | 691,200 |  |
State and Local Jurisdiction [Member] | Between 2029 and 2033 [Member] |  |  |  |  |  |  |
Operating Loss Carryforwards, Total | 1,300,000 |  |  |  | 1,300,000 |  |
State and Local Jurisdiction [Member] | Between 2034 and 2038 [Member] |  |  |  |  |  |  |
Operating Loss Carryforwards, Total | $ 316,100 |  |  |  | $ 316,100 |  |

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