Note 5 - Changes in the Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2015	Dec. 31, 2014
Fluids Systems [Member]
Beginning balance		$ 72,684	$ 74,591
Effects of foreign currency		$ (1,964)	(1,907)
Ending balance			72,684
Impairment	$ (70,700)	$ (70,720)
Mats and Integrated Services [Member]
Beginning balance		19,209	19,473
Effects of foreign currency		(200)	(264)
Ending balance	19,009	$ 19,009	19,209
Impairment
Beginning balance		$ 91,893	94,064
Effects of foreign currency		(2,164)	(2,171)
Ending balance	$ 19,009	19,009	$ 91,893
Impairment		$ (70,720)