Note 7 - Share-based Compensation - Stock Option Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		12 Months Ended
	Jan. 01, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Outstanding, weighted average remaining contractual life (Year)		9 years 124 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross		351
Granted, weighted average exercise price (in dollars per share)		$ 39.43
Exercised, shares (in shares)
Exercised, weighted average exercise price (in dollars per share)
Forfeited, shares (in shares)
Forfeited, weighted average exercise price (in dollars per share)
Outstanding, shares (in shares)		351
Outstanding, weighted average exercise price (in dollars per share)		$ 39.43
Outstanding, aggregate intrinsic value		$ 253
Exercisable, shares (in shares)		87
Exercisable, weighted average exercise price (in dollars per share)		$ 42.65
Exercisable, weighted average remaining contractual life (Year)		9 years 36 days
Predecessor [Member]
Outstanding, shares (in shares)	4,416	4,416	5,119	5,067
Outstanding, weighted average exercise price (in dollars per share)	$ 13.18	$ 13.18	$ 11.82	$ 11.70
Outstanding, weighted average remaining contractual life (Year)			3 years 313 days	4 years 149 days	5 years 146 days
Canceled, shares (in shares)	(4,416)
Canceled, weighted average exercise price (in dollars per share)	$ 13.18
Canceled, weighted average remaining contractual life (Year)	3 years 313 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross				267
Granted, weighted average exercise price (in dollars per share)				$ 10.49
Exercised, shares (in shares)				(154)
Exercised, weighted average exercise price (in dollars per share)				$ 2.94
Forfeited, shares (in shares)			(703)	(61)
Forfeited, weighted average exercise price (in dollars per share)			$ 3.19	$ 19.03
Outstanding, shares (in shares)			4,416	5,119	5,067
Outstanding, weighted average exercise price (in dollars per share)			$ 13.18	$ 11.82	$ 11.70
Outstanding, aggregate intrinsic value				$ 2,874	$ 21,395