Note 13 - Per Share Calculation - Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
Oct. 31, 2016	Jul. 31, 2016	Apr. 30, 2016	Jan. 31, 2016	Oct. 31, 2015	Jul. 31, 2015	Apr. 30, 2015	Jan. 31, 2015	Oct. 31, 2016	Oct. 31, 2015	Oct. 31, 2014
Net (loss) income	$ 22,289	$ (474)	$ (8,461)	$ (16,173)	$ 25,519	$ (7,684)	$ (19,559)	$ (14,376)	$ (2,819)	$ (16,100)	$ 307,144
Less: undistributed earnings allocated to nonvested shares											(7,107)
Numerator for basic earnings per share									(2,819)	(16,100)	300,037
Plus: undistributed earnings allocated to nonvested shares											7,107
Less: undistributed earnings reallocated to nonvested shares											(7,127)
Plus: interest on senior exchangeable notes											3,487
Numerator for diluted earnings per share									$ (2,819)	$ (16,100)	$ 303,504
Weighted-average number of common shares outstanding (in shares)	147,521,000	147,412,000	147,334,000	147,139,000	147,057,000	147,010,000	146,946,000	146,929,000	147,451	146,899	146,271
Share-based payments (in shares)											1,013
Weighted-average number of common shares outstanding (in shares)	160,590,000	147,412,000	147,334,000	147,139,000	160,299,000	147,010,000	146,946,000	146,929,000	147,451	146,899	162,441
Basic (loss) earnings per share (in dollars per share)	$ 0.14	$ 0	$ (0.06)	$ (0.11)	$ 0.17	$ (0.05)	$ (0.13)	$ (0.10)	$ (0.02)	$ (0.11)	$ 2.05
Diluted (loss) earnings per share (in dollars per share)	$ 0.14	$ 0	$ (0.06)	$ (0.11)	$ 0.16	$ (0.05)	$ (0.13)	$ (0.10)	$ (0.02)	$ (0.11)	$ 1.87
Senior Exchangeable Notes [Member]
Senior exchangeable notes (in shares)											15,157

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of convertible debt securities using the if-converted method.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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