Note 7 - Share-based Compensation (Tables)

12 Months Ended

Dec. 31, 2017

Notes Tables

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

	Year Ended December 3,
	2017
Expected volatility	50.1%	-	53.2%
Expected dividends		None
Exercise price	$30.83	-	$42.65
Expected term (in years)	5.7	-	6.0
Risk-free rate	2.03%	-	2.24%

	Year Ended December 3,
	2017
Expected volatility, including peer group	30.8%	-	81.6%
Expected dividends		None
30 calendar day volume weighted average stock price, including peer group	$2.13	-	$133.20
Expected term (in years)		3.0
Risk-free rate	1.94%	-	1.95%

	Year Ended December 31,
	2015
Expected volatility		52.3%
Expected dividends		None
Exercise price	$7.93	-	$27.12
Expected term (in years)	0.3	-	4.3
Risk-free rate	0.03%	-	1.3%

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

	Stock Options			Weighted Average Exercise Price		Weighted Average Remaining Contractual Life		Aggregate Intrinsic Value
	(in  thousands)					(in  years)		(in  thousands)
Outstanding at December 31, 2016 (Predecessor)		4,416		$	13.18		3.86	$	—
Canceled		(4,416	)		13.18		3.86		—
Outstanding at January 1, 2017 (Successor)		—		$	—		—	$	—
Granted		351			39.43		—		—
Exercised		—			—		—		—
Forfeited		—			—		—		—
Outstanding at December 31, 2017 (Successor)		351		$	39.43		9.34	$	253
Exercisable at December 31, 2017 (Successor)		87		$	42.65		9.10	$	—

	Stock Options			Weighted Average Exercise Price		Weighted Average Remaining Contractual Life		Aggregate Intrinsic Value
	(in  thousands)					(in  years)		(in  thousands)
Outstanding at December 31, 2014 (Predecessor)		5,067		$	11.70		5.40	$	21,395
Granted		267			10.49		—		—
Exercised		(154	)		2.94		—		—
Forfeited		(61	)		19.03		—		—
Outstanding at December 31, 2015 (Predecessor)		5,119		$	11.82		4.41	$	2,874
Granted		—			—		—		—
Exercised		—			—		—		—
Forfeited		(703	)		3.19		—		—
Outstanding at December 31, 2016 (Predecessor)		4,416		$	13.18		3.86	$	—

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

	Shares			Weighted Average Grant-Date Fair Value
	(in  thousands)
Non-vested at December 31, 2016 (Predecessor)		898		$	15.34
Canceled		(898	)		(15.34	)
Non-vested at January 1, 2017 (Successor)		—		$	—
Granted		1,664			37.92
Forfeited		(38	)		43.00
Vested		(288	)		43.83
Non-vested at December 31, 2017 (Successor)		1,338		$	36.51

	Shares			Weighted Average Grant-Date Fair Value
	(in  thousands)
Non-vested at December 31, 2014 (Predecessor)		1,377		$	23.39
Granted		2,850		$	13.50
Forfeited		(238	)	$	14.81
Vested		(718	)	$	21.97
Non-vested at December 31, 2015 (Predecessor)		3,271		$	15.70
Granted		—			—
Forfeited		(576	)		15.30
Vested		(1,797	)		15.92
Non-vested at December 31, 2016 (Predecessor)		898		$	15.34

Share-based Compensation, Performance Shares Award Nonvested Activity [Table Text Block]

	Shares		Weighted Average Grant-Date Fair Value
	(in  thousands)
Non-vested at December 31, 2017 (Predecessor)		—	$	—
Granted		92		37.20
Forfeited		—		—
Vested		—		—
Non-vested at December 31, 2017 (Successor)		92	$	37.20