Note 10 - Employee Benefit Plans - Change in Benefit Obligation and Plan Assets (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
Benefit obligation at beginning of the period	$ 5,443	$ 5,200
Benefit periodic cost	33
Interest cost	18
Withdrawal
Benefits paid	(35)
Actuarial gain	(16)
Translation adjustment	36
Benefit obligation at period end	5,479	5,443	$ 5,200
Fair value of plan assets at beginning of the period	5,576	5,500
Actual return on plan assets	27
Contributions	46
Withdrawal
Settlement/curtailment
Benefits paid	(35)
Administrative fee	(7)
Actuarial loss	(55)
Translation adjustment	38
Fair value of plan assets at period end	5,590	5,576	5,500
Funded status	111
Predecessor [Member]
Benefit obligation at beginning of the period	5,443	5,202	6,394
Benefit periodic cost		224	319
Interest cost		121	144
Withdrawal			(377)
Benefits paid		(237)	(289)
Actuarial gain		(108)	(1,117)
Translation adjustment		241	128
Benefit obligation at period end		5,443	5,202
Fair value of plan assets at beginning of the period	$ 5,576	5,486	5,486
Actual return on plan assets		181	182
Contributions		310	303
Withdrawal			(237)
Settlement/curtailment			82
Benefits paid		(237)	(297)
Administrative fee		(48)	(56)
Actuarial loss		(369)	(63)
Translation adjustment		253	86
Fair value of plan assets at period end		5,576	5,486
Funded status		$ 133	$ 284