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Note 15 - Stock Plans - Stock Option Activity (Details) - $ / shares
 12 Months Ended
Oct. 31, 2017
Oct. 31, 2016
Oct. 31, 2015
Options outstanding at beginning of period (in shares) 7,373,951 6,393,876 6,720,251
Options outstanding at beginning of period (in dollars per share) $ 4.03 $ 4.78 $ 5.23
Granted (in shares) 236,250 1,148,481 173,750
Granted (in dollars per share) $ 2.34 $ 1.95 $ 2.47
Exercised (in shares) 48,250 18,125
Exercised (in dollars per share) $ 2.07 $ 2.48
Forfeited (in shares) 452,375 51,125 203,436
Forfeited (in dollars per share) $ 5.85 $ 2.73 $ 3.78
Expired (in shares) 248,875 117,281 278,564
Expired (in dollars per share) $ 16.68 $ 25.05 $ 15.04
Options outstanding at end of period (in shares) 6,860,701 7,373,951 6,393,876
Options outstanding at end of period (in dollars per share) $ 3.40 $ 4.03 $ 4.78
Options exercisable at end of period (in shares) 5,259,011 5,071,181 4,566,290