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Note 9 - Leases (Details Textual)
$ in Millions
9 Months Ended
Jul. 31, 2020
USD ($)
Increase (Decrease) in Operating Lease, Right-of-Use Asset $ 1
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