Note 1 - Summary of Significant Accounting Policies (Details Textual) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Fluids Systems [Member]
Number of Operating Segments Through Geographic Regions	4
Number of Reportable Segments	2
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	$ 58.3	$ 32.0