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Note 15 - Common Stock (Details Textual) $ / shares in Units, $ in Millions	3 Months Ended			6 Months Ended
	Apr. 30, 2025 USD ($) shares	Jan. 31, 2025 shares	Apr. 30, 2024 shares	Apr. 30, 2025 USD ($) $ / shares shares	Apr. 30, 2024 USD ($) $ / shares shares	Apr. 11, 2025 USD ($)	Jan. 11, 2018	Aug. 15, 2008
Class of Stock [Line Items]
Common Stock Dividends Percent of Increase from Class A to Class B	110.00%			110.00%
Conversion of Stock From Class B to Class A Conversion Ratio				1
Shareholder Ownership Percentage of Increase							50.00%
Minimum [Member]
Class of Stock [Line Items]
Shareholder Ownership Percentage							5.00%
Common Class A [Member]
Class of Stock [Line Items]
Common Stock Voting Rights Votes per Share Number				1
Shareholder Ownership Percentage								4.90%
Number of Rights								1
Shareholders Pre Existing Ownership Percentage							5.00%
Shareholders Current Ownership Percentage							5.00%
Shareholders Ownership Percentage on Transfers							5.00%
Shareholders Ownership Percentage Threshold							5.00%
Treasury Stock, Value, Acquired, Cost Method					$ 15.0
Treasury Stock Acquired, Average Cost Per Share (in dollars per share) | $ / shares					$ 141.45
Stock Repurchase Program, Remaining Amount of Shares Authorized to be Repurchased	$ 26.4			$ 26.4
Common Class A [Member] | Maximum [Member]
Class of Stock [Line Items]
Stock Repurchase Program, Authorized Amount						$ 30.6
Common Class B [Member]
Class of Stock [Line Items]
Common Stock Voting Rights Votes per Share Number				10
Common Stock Outstanding [Member] | Common Class A [Member]
Class of Stock [Line Items]
Treasury Stock, Shares, Acquired (in shares) | shares	126,448	131,460	106,047	257,908	106,047
Treasury Stock, Value, Acquired, Cost Method				$ 30.1
Treasury Stock Acquired, Average Cost Per Share (in dollars per share) | $ / shares				$ 116.7

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Percentage of the corresponding regular cash dividend payable on a share of Class A Common Stock to the amount of any regular cash dividend payable on a share of Classs B Common Stock

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