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