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