Note 5 - Goodwill and Other Intangible Assets (Details Textual) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Jan. 01, 2017	Sep. 30, 2016	Mar. 31, 2016
Number of Reporting Units		3
Fair Value Inputs, Long-term Revenue Growth Rate		2.50%
Goodwill		$ 147,515					$ 0
Goodwill, Impairment Loss			$ 314,300
Indefinite-Lived Intangible Assets (Excluding Goodwill)			6,000
Finite-Lived Intangible Assets, Net		123,837			$ 60,400
Impairment of Intangible Assets, Finite-lived			55,000	$ 11,200
Amortization of Intangible Assets		4,163	10,800	14,500
Wireline Lift Assets [Member]
Finite-Lived Intangible Assets, Net	$ 38,200
Impairment of Intangible Assets, Finite-lived	50,400
Artificial Lift Asset [Member]
Finite-Lived Intangible Assets, Net	0
Impairment of Intangible Assets, Finite-lived	$ 4,600
IPR&D [Member]
Indefinite-Lived Intangible Assets (Excluding Goodwill)		$ 0	0			$ 6,000
Completion Services [Member]
Fair Value Inputs, Discount Rate		14.50%
Price to Earnings Multiple		10.6
Goodwill Impairment Testing, Income Approach, Percentage		80.00%
Goodwill Impairment Testing, Market Approach, Percentage		20.00%
Goodwill		$ 147,515	0
Goodwill, Impairment Loss			8
Well Support Services [Member]
Fair Value Inputs, Discount Rate		14.00%
Price to Earnings Multiple		10.5
Goodwill			0	307,677
Goodwill, Impairment Loss			314,293
Other Services [Member]
Fair Value Inputs, Discount Rate		16.00%
Price to Earnings Multiple		11
Goodwill Impairment Testing, Income Approach, Percentage		50.00%
Goodwill Impairment Testing, Market Approach, Percentage		50.00%
Goodwill			0	$ 307,677
Goodwill, Impairment Loss			$ 314,301