Note 20 - 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 Receivable, Current	$ 834.6
Operating Leases, Future Minimum Payments Receivable, in Two Years	755.9
Operating Leases, Future Minimum Payments Receivable, in Three Years	664.1
Operating Leases, Future Minimum Payments Receivable, in Four Years	567.7
Operating Leases, Future Minimum Payments Receivable, in Five Years	471.5
Operating Leases, Future Minimum Payments Receivable, Thereafter	1,971.7
Straight Line Rent	16.5	$ 14.8	$ 8.4
Operating Leases, Future Minimum Payments Due, Next Twelve Months	10.3
Operating Leases, Future Minimum Payments, Due in Two Years	9.9
Operating Leases, Future Minimum Payments, Due in Three Years	9.2
Operating Leases, Future Minimum Payments, Due in Four Years	8.6
Operating Leases, Future Minimum Payments, Due in Five Years	8.3
Operating Leases, Future Minimum Payments, Due Thereafter	143.0
Letters of Credit Outstanding, Amount	40.8
Performance and Surety Bonds	$ 30.1
Revenues from Rental Property [Member] | Product Concentration Risk [Member]
Concentration Risk, Percentage	98.00%	98.00%	98.00%
Minimum [Member]
Lessor Leasing Arrangements, Operating Leases, Term of Contract	5 years
Maximum [Member]
Lessor Leasing Arrangements, Operating Leases, Term of Contract	25 years