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Note 13 - Per Share Calculations (Details Textual) - shares
shares in Millions
12 Months Ended
Oct. 31, 2017
Oct. 31, 2016
Oct. 31, 2015
Non Vested Stock and Outstanding Options [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 2.7   0.2
Convertible Debt Securities [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 10.0 14.6 15.2
Out of the Money Stock Options [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 4.6 7.3 3.0