Note 8 - Financial Information by Segment (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2016	Mar. 31, 2015
Fluids Systems [Member]
Revenues
Revenues	$ 98,651	$ 171,902
Operating Income (loss)
Operating Income (loss)	(15,207)	(1,702)
Mats and Integrated Services [Member]
Revenues
Revenues	15,893	36,562
Operating Income (loss)
Operating Income (loss)	3,736	15,647
Corporate Segment [Member]
Operating Income (loss)
Operating Income (loss)	(7,354)	(7,817)
Revenues	114,544	208,464
Operating Income (loss)	$ (18,825)	$ 6,128

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

Name:	us-gaap_Revenues
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration