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Note 15 - Income Taxes (Details Textual) - USD ($) $ in Thousands |  | 3 Months Ended | 6 Months Ended | 10 Months Ended
--- | --- | --- | --- | ---
Dec. 22, 2017 | Apr. 30, 2018 | Jul. 31, 2017 | Apr. 30, 2017 | Apr. 30, 2018 | Apr. 30, 2017 | Oct. 31, 2018
Income Tax Expense (Benefit), Total |  | $ 245 |  | $ (1,017) | $ 583 | $ (551) |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 35.00% |  |  |  |  |  |
Revaluation of Deferred Tax Asset, Decrease |  |  |  |  | 298,500 |  |
Revaluation of Deferred Tax Liabilities, Decrease |  |  |  |  | 12,200 |  |
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability |  |  |  |  | 0 |  |
Deferred Tax Assets, Valuation Allowance, Total |  | 661,800 |  |  | 661,800 |  |
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest, Total |  | (9,578) | $ (50,200) | (7,699) | (40,049) | (7,376) |
Gain (Loss) on Extinguishment of Debt, Total |  | (1,440) | $ (42,300) | (242) | (1,440) | 7,404 |
Increase in Interest Incurred Per Year, Amount |  |  |  |  | 23,400 |  |
Scenario, Forecast [Member] |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  |  |  |  |  | 21.00%
Domestic Tax Authority [Member] |  |  |  |  |  |  |
Income Tax Expense (Benefit), Total |  |  |  | (3,309) |  | (2,825) |
Operating Loss Carryforwards, Total |  | 1,700,000 |  |  | 1,700,000 |  |
State and Local Jurisdiction [Member] |  |  |  |  |  |  |
Income Tax Expense (Benefit), Total |  | 245 |  | $ 2,292 | 583 | $ 2,274 |
Operating Loss Carryforwards, Total |  | 2,600,000 |  |  | 2,600,000 |  |
State and Local Jurisdiction [Member] | Between 2018 and 2022 [Member] |  |  |  |  |  |  |
Operating Loss Carryforwards, Total |  | 247,100 |  |  | 247,100 |  |
State and Local Jurisdiction [Member] | Between 2023 and 2027 [Member] |  |  |  |  |  |  |
Operating Loss Carryforwards, Total |  | 463,100 |  |  | 463,100 |  |
State and Local Jurisdiction [Member] | Between 2028 and 2032 [Member] |  |  |  |  |  |  |
Operating Loss Carryforwards, Total |  | 1,500,000 |  |  | 1,500,000 |  |
State and Local Jurisdiction [Member] | Between 2033 and 2037 [Member] |  |  |  |  |  |  |
Operating Loss Carryforwards, Total |  | $ 348,700 |  |  | $ 348,700 |  |

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