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Note 10 - Commitments and Contingencies (Details Textual) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Operating Leases, Future Minimum Payments Due $ 36.7    
Operating Leases, Future Minimum Payments Due, Next Twelve Months 15.2    
Operating Leases, Future Minimum Payments, Due in Two Years 9.4    
Operating Leases, Future Minimum Payments, Due in Three Years 5.9    
Operating Leases, Future Minimum Payments, Due in Four Years 4.3    
Operating Leases, Future Minimum Payments, Due in Five Years 1.8    
Operating Leases, Future Minimum Payments, Due Thereafter 0.1    
Operating Leases, Rent Expense, Net 44.1 $ 39.5 $ 39.1
Purchase Obligation, Due in Next Twelve Months 967.0    
Loss Contingency, Estimate of Possible Loss $ 4.4