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Note 15 - Stock Plans (Tables)

12 Months Ended

Oct. 31, 2017

Notes Tables

Share-based Compensation, Stock Options, Activity [Table Text Block]

		October 31, 2017				Weighted-Average Exercise Price				October 31, 2016				Weighted-Average Exercise Price				October 31, 2015				Weighted-Average Exercise Price
Options outstanding at beginning of period			7,373,951			$	4.03				6,393,876			$	4.78				6,720,251			$	5.23
Granted			236,250			$	2.34				1,148,481			$	1.95				173,750			$	2.47
Exercised			48,250			$	2.07				-			$	-				18,125			$	2.48
Forfeited			452,375			$	5.85				51,125			$	2.73				203,436			$	3.78
Expired			248,875			$	16.68				117,281			$	25.05				278,564			$	15.04
Options outstanding at end of period			6,860,701			$	3.40				7,373,951			$	4.03				6,393,876			$	4.78
Options exercisable at end of period			5,259,011								5,071,181								4,566,290

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]

					Number				Weighted- Average				Weighted- Average Remaining Contractual
Range of Exercise Prices					Outstanding				Exercise Price				Life
$1.54	–	$2.41				2,320,409			$	2.01				6.71
$2.42	–	$4.41				2,496,542			$	2.84				3.26
$4.42	–	$6.46				2,043,750			$	5.70				2.57
						6,860,701			$	3.41				4.22

					Number				Weighted- Average				Weighted- Average Remaining Contractual
Range of Exercise Prices					Exercisable				Exercise Price				Life
$1.54	–	$2.41				1,003,714			$	2.00				4.02
$2.42	–	$4.41				2,322,797			$	2.77				2.96
$4.42	–	$6.46				1,932,500			$	5.66				2.40
						5,259,011			$	3.69				2.96

Schedule of Nonvested Share Activity [Table Text Block]

		Shares				Weighted-Average Grant Date Fair Value
Nonvested at beginning of period			7,239,469			$	2.80
Granted			1,233,700			$	2.56
Vested			1,216,359			$	4.92
Forfeited			1,082,333			$	2.59
Nonvested at end of period			6,174,477			$	2.36