Note 7 - Operating Segment Information - Operating Income (Loss) by Operating Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Revenue	$ 26,453		$ 50,819
Direct operating expenses	20,022		41,997
General and administrative expenses	7,245		14,154
Depreciation and amortization	9,002		17,943
(Gain) loss on sale of assets	(228)		(203)
Operating loss	(9,588)		(23,072)
Drydock expense
Pre-petition restructuring charges
Total assets	427,458		427,458		$ 471,955
Predecessor [Member]
Revenue		$ 24,641		$ 49,000
Direct operating expenses		19,384		38,559
General and administrative expenses		8,804		18,381
Depreciation and amortization		13,578		27,148
(Gain) loss on sale of assets		(32)		5,241
Operating loss		(30,680)		(62,672)
Drydock expense		1,654		4,556
Pre-petition restructuring charges		11,933		17,787
North Sea [Member]
Revenue	16,849		32,271
Direct operating expenses	12,050		26,084
General and administrative expenses	1,683		3,584
Depreciation and amortization	5,177		10,311
(Gain) loss on sale of assets	(243)		(243)
Operating loss	(1,818)		(7,465)
Total assets	253,040		253,040		271,759
North Sea [Member] | Predecessor [Member]
Revenue		14,939		28,934
Direct operating expenses		10,212		20,286
General and administrative expenses		1,883		3,672
Depreciation and amortization		5,707		11,325
(Gain) loss on sale of assets
Operating loss		(4,564)		(10,930)
Drydock expense		1,534		4,414
Pre-petition restructuring charges		167		167
South East Asia [Member]
Revenue	1,669		3,606
Direct operating expenses	1,508		3,127
General and administrative expenses	478		1,033
Depreciation and amortization	1,370		2,739
(Gain) loss on sale of assets	15		15
Operating loss	(1,702)		(3,308)
Total assets	63,795		63,795		66,299
South East Asia [Member] | Predecessor [Member]
Revenue		2,141		5,309
Direct operating expenses		2,224		4,468
General and administrative expenses		1,015		1,775
Depreciation and amortization		1,783		3,565
(Gain) loss on sale of assets		(32)		(32)
Operating loss		(2,847)		(4,465)
Drydock expense		(8)		(8)
Pre-petition restructuring charges		6		6
Americas [Member]
Revenue	7,935		14,942
Direct operating expenses	6,464		12,786
General and administrative expenses	1,098		2,086
Depreciation and amortization	2,281		4,557
(Gain) loss on sale of assets			25
Operating loss	(1,908)		(4,512)
Total assets	105,280		105,280		118,654
Americas [Member] | Predecessor [Member]
Revenue		7,561		14,757
Direct operating expenses		6,948		13,805
General and administrative expenses		1,428		3,626
Depreciation and amortization		5,488		11,053
(Gain) loss on sale of assets				5,273
Operating loss		(6,476)		(19,195)
Drydock expense		128		150
Pre-petition restructuring charges		45		45
Other [Member]
Revenue
Direct operating expenses
General and administrative expenses	3,986		7,451
Depreciation and amortization	174		336
(Gain) loss on sale of assets
Operating loss	(4,160)		(7,787)
Total assets	$ 5,343		$ 5,343		$ 15,243
Other [Member] | Predecessor [Member]
Revenue
Direct operating expenses
General and administrative expenses		4,478		9,308
Depreciation and amortization		600		1,205
(Gain) loss on sale of assets
Operating loss		(16,793)		(28,082)
Drydock expense
Pre-petition restructuring charges		$ 11,715		$ 17,569