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Note 3 - Operating Property Activities (Tables)
3 Months Ended
Mar. 31, 2018
Notes Tables  
Disposal Groups, Including Discontinued Operations [Table Text Block]
   
Three Months Ended March 31,
 
   
2018
   
2017
 
Aggregate sales price
  $
202.5
    $
57.8
 
Gain on sale of operating properties
  $
50.2
    $
1.7
 
Impairment charges
  $
2.4
    $
1.2
 
Number of operating properties sold
   
19
     
4
 
Number of out-parcels sold
   
1
     
2