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Note 6 - Earnings (Loss) Per Share (Details Textual) - shares
3 Months Ended 6 Months Ended
Apr. 30, 2020
Apr. 30, 2019
Apr. 30, 2020
Apr. 30, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) 392,838 121,015 392,838 121,015