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