Note 11 - Segment Data (Details Textual) - USD ($) $ in Millions	3 Months Ended		9 Months Ended	12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Sep. 30, 2015	Sep. 30, 2016
North America [Member] | Cost of Sales [Member]
Severance Costs		$ 1.4	$ 3.9
North America [Member] | Selling, General and Administrative Expenses [Member]
Severance Costs		0.9	2.0
North America [Member] | Fluids Systems [Member]
Severance Costs		2.0	5.3
North America [Member] | Mats and Integrated Services [Member]
Severance Costs		0.2	0.4
North America [Member] | Corporate Segment [Member]
Severance Costs		0.1	0.2
North America [Member] | Employee Severance [Member]
Restructuring Reserve		2.1	2.1
North America [Member] | Scenario, Forecast [Member]
Severance Costs	$ 0.8			$ 1.5
North America [Member]
Severance Costs		$ 2.3	$ 5.9
Workforce Reduction, Number of Employees			369
Percentage of Workforce Reduction			28.00%