Note 5 - Goodwill and Other Intangible Assets - Changes in the Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Mar. 31, 2016
Impairment expense		$ (314,300)
O-Tex acquisition	$ 147,515
Balance, goodwill	147,515		$ 0
Well Support Services [Member]
Balance, goodwill	0	307,677
Measurement period adjustments		5,382
Impairment expense		(314,293)
Foreign currency translation and other adjustments		1,234
Balance, goodwill		0
Other Services [Member]
Balance, goodwill	0	307,677
Measurement period adjustments		5,390
Impairment expense		(314,301)
Foreign currency translation and other adjustments		1,234
Balance, goodwill		0
Completion Services [Member]
Balance, goodwill	0
Measurement period adjustments		8
Impairment expense		(8)
O-Tex acquisition	147,515
Balance, goodwill	$ 147,515	$ 0