Note 15 - Stock Plans (Tables)

12 Months Ended

Oct. 31, 2018

Notes Tables

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

	October 31, 2018		Weighted-Average Exercise Price		October 31, 2017		Weighted-Average Exercise Price		October 31, 2016		Weighted-Average Exercise Price
Options outstanding at beginning of period		6,860,701	$	3.40		7,373,951	$	4.03		6,393,876	$	4.78
Granted		945,625	$	2.25		236,250	$	2.34		1,148,481	$	1.95
Exercised		30,250	$	2.00		48,250	$	2.07		-	$	-
Forfeited		50,000	$	2.57		452,375	$	5.85		51,125	$	2.73
Expired		761,750	$	6.28		248,875	$	16.68		117,281	$	25.05
Options outstanding at end of period		6,964,326	$	2.95		6,860,701	$	3.40		7,373,951	$	4.03
Options exercisable at end of period		4,793,490				5,259,011				5,071,181

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		2,645,784	$	2.00		6.32
$2.42	–	$4.41		3,004,042	$	2.77		3.57
$4.42	–	$6.28		1,314,500	$	5.27		2.66
				6,964,326	$	2.95		4.44

			Number		Weighted- Average		Weighted- Average Remaining Contractual
Range of Exercise Prices			Exercisable		Exercise Price		Life
$1.54	–	$2.41		1,108,534	$	1.97		3.65
$2.42	–	$4.41		2,370,456	$	2.81		2.09
$4.42	–	$6.28		1,314,500	$	5.27		2.66
				4,793,490	$	3.29		2.61

Schedule of Nonvested Share Activity [Table Text Block]

	Shares		Weighted-Average Grant Date Fair Value
Nonvested at beginning of period		6,174,477	$	2.36
Granted		2,129,073	$	2.55
Vested		705,144	$	2.31
Forfeited		2,423,148	$	1.98
Nonvested at end of period		5,175,258	$	2.62