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Note 4 - Leases (Details Textual) - USD ($)
$ in Millions
12 Months Ended
Oct. 31, 2020
Oct. 31, 2019
Oct. 31, 2018
Increase (Decrease) in Operating Lease, Right-of-Use Asset $ 2.8    
Increase (Decrease) in Operating Lease, Liability $ 2.8    
Operating Leases, Rent Expense, Total   $ 14.8 $ 14.4
Minimum [Member] | Office Leases [Member]      
Lessee, Operating Lease, Term of Contract (Year) 3 years    
Maximum [Member] | Office Leases [Member]      
Lessee, Operating Lease, Term of Contract (Year) 5 years