Note 15 - Common Stock (Details Textual) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Apr. 30, 2024 USD ($)	Jan. 31, 2023 USD ($)	Apr. 30, 2024 USD ($) $ / shares shares	Apr. 30, 2023 USD ($) $ / shares shares	Sep. 01, 2022 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%
Treasury Stock, Value, Acquired, Cost Method	$ 15,147	$ 4,800
Minimum [Member]
Class of Stock [Line Items]
Shareholder Ownership Percentage						5.00%
Common Class A [Member]
Class of Stock [Line Items]
Treasury Stock, Shares, Acquired (in shares) | shares			106,047	118,478
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%
Stock Repurchase Program, Authorized Amount					$ 50,000
Treasury Stock, Value, Acquired, Cost Method			$ 15,000	$ 4,800
Treasury Stock Acquired, Average Cost Per Share (in dollars per share) | $ / shares			$ 141.45	$ 40.51
Stock Repurchase Program, Remaining Amount of Shares Authorized to be Repurchased	$ 18,000		$ 18,000
Common Class B [Member]
Class of Stock [Line Items]
Common Stock Voting Rights Votes per Share Number			10