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Note 20 - Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2017

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]

		Number of Restricted Stock Units				Weighted-Average Grant Date Fair Values
Outstanding on December 31, 2016			651,544			$	16.57
Granted			222,853			9.20
Vested			399,527			17.56
Forfeited			6,189			17.26
Outstanding on December 31, 2017			468,681			12.21

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

		Shares Under Option				Weighted Average Exercise Price Per Share				Weighted Average Remaining Contractual Life (Years)		Aggregate Intrinsic Value ($ millions)
Outstanding on December 31, 2016			2,214,459			$	17.10
Granted			2,605,051			11.93
Forfeited			11,655			16.80
Outstanding on December 31, 2017			4,807,855			14.30				5.75			-
Exercisable on December 31, 2017			1,400,690			18.73				4.31			-
Expected to vest December 31, 2017			3,407,165			12.48				6.28			-

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

		Year Ended December 31,
		2017				2016				2015
Weighted-average fair value of options granted		$	2.26			$	5.56			$	5.94
Weighted-average risk-free interest rate		1.77%				1.32%				1.46%
Range of risk-free interest rates		1.64% - 2.11%				0.93% - 1.96%				1.26% - 1.60%
Weighted-average expected option lives		4.5 years				4.6 years				4.5 years
Expected option lives		4.5 years				4.5 - 4.9 years				4.5 years
Weighted-average volatility		46%				47%				46%
Range of expected volatilities		46% - 49%				44% - 51%				40% - 49%
Weighted-average expected dividend yield		0.0%				0.0%				0.0%

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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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-Publisher FASB
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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year.

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