Note 12 - Financial Information by Business Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Well Site Services Completion Services [Member]
Revenues from unaffiliated customers	$ 36,824	$ 69,421	$ 77,773	$ 187,531
Depreciation and amortization	17,615	19,145	35,558	38,588
Operating income (loss)	(21,466)	(10,969)	(45,801)	1,499
Capital expenditures	2,129	12,616	6,667	35,378
Total assets	489,750	559,211	489,750	559,211
Well Site Services Drilling Services [Member]
Revenues from unaffiliated customers	3,869	16,703	6,641	40,382
Depreciation and amortization	5,902	6,962	12,424	13,644
Operating income (loss)	(5,951)	(4,342)	(14,056)	(6,881)
Capital expenditures	246	2,119	499	8,670
Total assets	87,001	114,340	87,001	114,340
Total Well Site Services [Member]
Revenues from unaffiliated customers	40,693	86,124	84,414	227,913
Depreciation and amortization	23,517	26,107	47,982	52,232
Operating income (loss)	(27,417)	(15,311)	(59,857)	(5,382)
Capital expenditures	2,375	14,735	7,166	44,048
Total assets	576,751	673,551	576,751	673,551
Offshore Products [Member]
Revenues from unaffiliated customers	135,156	183,134	261,090	378,704
Depreciation and amortization	5,611	5,967	11,265	12,067
Operating income (loss)	21,676	34,836	44,987	71,377
Capital expenditures	5,583	15,273	10,974	24,166
Total assets	877,609	965,157	877,609	965,157
Equity in earnings of unconsolidated affiliates	(97)	54	(119)	3
Corporate and Eliminations [Member]
Revenues from unaffiliated customers
Depreciation and amortization	287	358	570	712
Operating income (loss)	(11,420)	(10,801)	(22,396)	(23,511)
Capital expenditures	160	450	258	526
Total assets	28,476	42,276	28,476	42,276
Revenues from unaffiliated customers	175,849	269,258	345,504	606,617
Depreciation and amortization	29,415	32,432	59,817	65,011
Operating income (loss)	(17,161)	8,724	(37,266)	42,484
Capital expenditures	8,118	30,458	18,398	68,740
Total assets	1,482,836	1,680,984	1,482,836	1,680,984	$ 1,596,471
Equity in earnings of unconsolidated affiliates	$ (97)	$ 54	$ (119)	$ 3