Note 10 - Commitments and Contingencies (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating Leases, Future Minimum Payments Due	$ 28.1
Operating Leases, Future Minimum Payments Due, Next Twelve Months	13.5
Operating Leases, Future Minimum Payments, Due in Two Years	8.7
Operating Leases, Future Minimum Payments, Due in Three Years	3.9
Operating Leases, Future Minimum Payments, Due in Four Years	1.3
Operating Leases, Future Minimum Payments, Due in Five Years	0.5
Operating Leases, Future Minimum Payments, Due Thereafter	0.2
Operating Leases, Rent Expense	39.5	$ 39.1	$ 33.2
Purchase Obligation, Due in Next Twelve Months	463.0
Loss Contingency, Estimate of Possible Loss	$ 4.4