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Note 2 - Stock Compensation (Details Textual) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Apr. 30, 2021
Apr. 30, 2020
Apr. 30, 2021
Apr. 30, 2020
Share-based Payment Arrangement, Expense $ 0.9 $ 0.3 $ 1.8 $ 0.9
Allocated Share Based Compensation, Income   0.1   0.2
Share-based Payment Arrangement, Option [Member]        
Share-based Payment Arrangement, Expense $ 0.1 $ 0.1 $ 0.1 $ 0.3