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Note 21 - Transactions With Related Parties (Details Textual) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Apr. 30, 2021
Apr. 30, 2020
Apr. 30, 2021
Apr. 30, 2020
Tavit Najarian [Member]        
Related Party Transaction, Amounts of Transaction $ 0.1 $ 0.2 $ 0.2 $ 0.3