Note 9 - Equity Incentive Plans - Activity of Stock Option Incentive Plans (Details) - Predecessor [Member] - $ / shares	10 Months Ended	12 Months Ended
	Nov. 14, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Outstanding (in shares)	212,019	212,019	222,019	140,293
Outstanding, weighted average exercise price (in dollars per share)	$ 27.69	$ 27.69	$ 27.01	$ 41.68
Granted (in shares)		0	0	165,879
Granted, weighted average exercise price (in dollars per share)				$ 12.45
Forfeitures (in shares)	(212,019)		(10,000)	(84,153)
Forfeitures, weighted average exercise price (in dollars per share)	$ 27.69		$ 12.55	$ 26.85
Outstanding (in shares)			212,019	222,019
Outstanding, weighted average exercise price (in dollars per share)			$ 27.69	$ 27.01
Exercisable shares and weighted average exercise price (in shares)			128,532	57,859
Exercisable shares and weighted average exercise price (in dollars per share)			$ 33.83	$ 42.05
Shares available for future grants: (in shares)	876,553		414,975	1,061,130