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Note 3 - Summary of Properties and Land Parcels Disposed of (Details)
$ in Millions
3 Months Ended
Mar. 31, 2016
USD ($)
Mar. 31, 2015
USD ($)
Other Joint Venture Programs [Member]    
Number of Properties 2 1 [1]
Number of Land Parcels [1]
Aggregate Sales Price $ 21.6 $ 5.8 [1]
Kim Pru and Kim Pru II [Member]    
Number of Properties   1
Number of Land Parcels  
Aggregate Sales Price   $ 23.2
Canadian Properties [Member]    
Number of Properties 7 3
Number of Land Parcels 1
Aggregate Sales Price $ 322.9 $ 190.7
[1] The Company acquired the remaining interest in this property during the three months ended March 31, 2015.