Note 9 - Commitments and Contingencies (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Operating Leases, Future Minimum Payments Due	$ 21.1
Operating Leases, Future Minimum Payments Due, Next Twelve Months	7.8
Operating Leases, Future Minimum Payments, Due in Two Years	9.5
Operating Leases, Future Minimum Payments, Due in Three Years	3.5
Operating Leases, Future Minimum Payments, Due in Four Years	0.3
Operating Leases, Rent Expense	27.5	24.8	21.8
Purchase Commitment, Remaining Minimum Amount Committed	283
Loss Contingency, Estimate of Possible Loss	$ 5.0