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Note 19 - Commitments and Contingencies (Details Textual) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Straight Line Rent $ 15.7 $ 16.5 $ 14.8
Letters of Credit Outstanding, Amount 40.4    
Performance and Surety Bonds $ 20.0    
Revenues from Rental Property [Member] | Product Concentration Risk [Member]      
Concentration Risk, Percentage 98.00% 98.00% 98.00%
Minimum [Member]      
Lessor, Operating Lease, Term of Contract 5 years    
Maximum [Member]      
Lessor, Operating Lease, Term of Contract 25 years