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Note 15 - Stock Plans (Details) - Stock Option Activity - $ / shares
 12 Months Ended
Oct. 31, 2015
Oct. 31, 2014
Oct. 31, 2013
Stock Option Activity [Abstract]      
Options outstanding at beginning of period 6,720,251 6,591,054 6,019,070
Options outstanding at beginning of period (in Dollars per share) $ 5.23 $ 5.74 $ 5.97
Granted 173,750 376,822 887,500
Granted (in Dollars per share) $ 2.47 $ 4.41 $ 6.28
Exercised 18,125 42,375 44,812
Exercised (in Dollars per share) $ 2.48 $ 2.74 $ 2.67
Forfeited 203,436 56,375 76,500
Forfeited (in Dollars per share) $ 3.78 $ 2.66 $ 3.06
Expired 278,564 148,875 194,204
Expired (in Dollars per share) $ 15.04 $ 27.42 $ 16.92
Options outstanding at end of period 6,393,876 6,720,251 6,591,054
Options outstanding at end of period (in Dollars per share) $ 4.78 $ 5.23 $ 5.74
Options exercisable at end of period 4,566,290 4,100,413 3,161,952