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Note 15 - Stock Plans - Stock Option Activity (Details) - $ / shares
 12 Months Ended
Oct. 31, 2016
Oct. 31, 2015
Oct. 31, 2014
Options outstanding at beginning of period (in shares) 6,393,876 6,720,251 6,591,054
Options outstanding at beginning of period (in dollars per share) $ 4.78 $ 5.23 $ 5.74
Granted (in shares) 1,148,481 173,750 376,822
Granted (in dollars per share) $ 1.95 $ 2.47 $ 4.41
Exercised (in shares) 18,125 42,375
Exercised (in dollars per share)   $ 2.48 $ 2.74
Forfeited (in shares) 51,125 203,436 56,375
Forfeited (in dollars per share) $ 2.73 $ 3.78 $ 2.66
Expired (in shares) 117,281 278,564 148,875
Expired (in dollars per share) $ 25.05 $ 15.04 $ 27.42
Options outstanding at end of period (in shares) 7,373,951 6,393,876 6,720,251
Options outstanding at end of period (in dollars per share) $ 4.03 $ 4.78 $ 5.23
Options exercisable at end of period (in shares) 5,071,181 4,566,290 4,100,413