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Note 15 - Common Stock (Details Textual) $ / shares in Units, $ in Millions	9 Months Ended
	Jul. 31, 2025 USD ($) $ / shares shares	Jul. 31, 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%
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%
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	257,908	188,800
Treasury Stock, Value, Acquired, Cost Method	$ 30.1	$ 26.5
Treasury Stock Acquired, Average Cost Per Share (in dollars per share) | $ / shares	$ 116.7	$ 140.31
Stock Repurchase Program, Remaining Amount of Shares Authorized to be Repurchased	$ 26.4

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