Note 13 - Per Share Calculation - Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Jul. 31, 2022	Jul. 31, 2021	Jul. 31, 2022	Jul. 31, 2021
Net income	$ 82,614	$ 47,702	$ 169,857	$ 555,337
Less: preferred stock dividends	(2,669)	0	(8,007)	0
Less: undistributed earnings allocated to nonvested shares	(9,139)	(4,426)	(20,201)	(54,165)
Numerator for basic earnings per share	70,806	43,276	141,649	501,172
Plus: undistributed earnings allocated to nonvested shares	9,139	4,426	20,202	54,165
Less: undistributed earnings reallocated to nonvested shares	(9,141)	(4,436)	(20,214)	(55,259)
Numerator for diluted earnings per share	$ 70,804	$ 43,266	$ 141,637	$ 500,078
Denominator for basic earnings per share – weighted average shares outstanding (in shares)	6,485	6,315	6,424	6,263
Share based payments (in shares)	59	119	83	107
Denominator for diluted earnings per share – weighted average shares outstanding (in shares)	6,544	6,434	6,507	6,370
Net income per common share (in dollars per share)	$ 10.92	$ 6.85	$ 22.05	$ 80.02
Diluted earnings per share (in dollars per share)	$ 10.82	$ 6.72	$ 21.77	$ 78.51