Note 10 - Employee Benefit Plans - Net Periodic Benefit Cost (Details) - Norwegian Pension Plan [Member] - USD ($) $ in Thousands	2 Months Ended	10 Months Ended	12 Months Ended
	Dec. 31, 2017	Nov. 14, 2017	Dec. 31, 2016	Dec. 31, 2015
Service cost	$ 33
Interest cost	18
Return on plan assets	(27)
Administrative fee	7
Recognized net actuarial gain	44
Net periodic benefit cost	$ 75
Predecessor [Member]
Service cost		$ 222	$ 329	$ 416
Interest cost		120	149	169
Return on plan assets		(180)	(182)	(185)
Administrative fee		48	56	61
Recognized net actuarial gain		296	(329)	(544)
Net periodic benefit cost		$ 506	$ 23	$ (83)