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Note 16 - Income Taxes (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended | 42 Months Ended
--- | --- | --- | --- | ---
Apr. 30, 2021 | Apr. 30, 2020 | Apr. 30, 2021 | Apr. 30, 2020 | Oct. 31, 2020 | Apr. 30, 2021
Income Tax Expense (Benefit), Total | $ (457,644) | $ 100 | $ (457,018) | $ 1,812 |  |
Deferred Tax Assets, Valuation Allowance, Total | 102,900 |  | 102,900 |  |  | $ 102,900
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest, Total | 31,032 | 4,179 | 50,617 | (3,257) | $ 55,400 | 114,500
Federal Deferred Tax Assets Related to NOLs and Other Matters [Member] |  |  |  |  |  |
Deferred Tax Assets, Valuation Allowance, Total |  |  |  |  | 396,500 |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount |  |  | (396,500) |  |  |
Deferred Tax Assets Related to State NOLs [Member] |  |  |  |  |  |
Deferred Tax Assets, Valuation Allowance, Total | 102,900 |  | 102,900 |  | $ 181,000 | 102,900
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | (78,100) |  |  |  |  |
State and Local Jurisdiction [Member] |  |  |  |  |  |
Income Tax Expense (Benefit), Total | (91,374) | 100 | (90,748) | 1,812 |  |
Operating Loss Carryforwards, Total | 2,400,000 |  | 2,400,000 |  |  | 2,400,000
State and Local Jurisdiction [Member] | Indefinite Tax Period [Member] |  |  |  |  |  |
Operating Loss Carryforwards, Total | 48,800 |  | 48,800 |  |  | 48,800
State and Local Jurisdiction [Member] | Between 2021 and 2025 [Member] |  |  |  |  |  |
Operating Loss Carryforwards, Total | 232,600 |  | 232,600 |  |  | 232,600
State and Local Jurisdiction [Member] | Between 2026 and 2030 [Member] |  |  |  |  |  |
Operating Loss Carryforwards, Total | 1,300,000 |  | 1,300,000 |  |  | 1,300,000
State and Local Jurisdiction [Member] | Between 2031 and 2035 [Member] |  |  |  |  |  |
Operating Loss Carryforwards, Total | 587,900 |  | 587,900 |  |  | 587,900
State and Local Jurisdiction [Member] | Between 2036 and 2040 [Member] |  |  |  |  |  |
Operating Loss Carryforwards, Total | 239,200 |  | 239,200 |  |  | 239,200
Domestic Tax Authority [Member] |  |  |  |  |  |
Income Tax Expense (Benefit), Total | (366,270) | $ 0 | (366,270) | $ 0 |  |
Domestic Tax Authority [Member] | Between 2028 and 2038 [Member] |  |  |  |  |  |
Operating Loss Carryforwards, Total | 1,400,000 |  | 1,400,000 |  |  | 1,400,000
Domestic Tax Authority [Member] | Indefinite Tax Period [Member] |  |  |  |  |  |
Operating Loss Carryforwards, Total | $ 15,700 |  | $ 15,700 |  |  | $ 15,700

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