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Note 5 - Discontinued Operations and Assets Held-for-Sale (Details) (USD $)
 12 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Assets Held-for-sale [Member]
Operating Properties [Member]
Dec. 31, 2011
Assets Held-for-sale [Member]
Operating Properties [Member]
Dec. 31, 2013
Assets Held-for-sale [Member]
Eight Operating Properties [Member]
Dec. 31, 2012
Assets Held-for-sale [Member]
Three Operating Properties [Member]
Dec. 31, 2011
Assets Held-for-sale [Member]
Prior to Sales [Member]
Remaining [Member]
Dec. 31, 2012
Assets Held-for-sale [Member]
Prior to Sales [Member]
Dec. 31, 2013
Assets Held-for-sale [Member]
Remaining [Member]
Dec. 31, 2011
Assets Held-for-sale [Member]
Remaining [Member]
Dec. 31, 2012
Assets Held-for-sale [Member]
Operating Properties [Member]
Dec. 31, 2012
Assets Held-for-sale [Member]
Land Parcels [Member]
Dec. 31, 2013
Assets Held-for-sale [Member]
Dec. 31, 2012
Assets Held-for-sale [Member]
Dec. 31, 2011
Assets Held-for-sale [Member]
Dec. 31, 2013
Operating Properties [Member]
Sold [Member]
Dec. 31, 2012
Operating Properties [Member]
Sold [Member]
Dec. 31, 2011
Operating Properties [Member]
Sold [Member]
Dec. 31, 2012
Prior to Sales [Member]
Remaining [Member]
Note 5 - Discontinued Operations and Assets Held-for-Sale (Details) [Line Items]                                      
Number of Real Estate Properties     19 7             18   5 1   1 2 5  
Gross Leasable Area 4,057 [1] 3,086 [1] 1,900,000                 2,100,000     200,000        
Real Estate Held-for-sale $ 70,300,000 $ 3,400,000         $ 10,000,000   $ 178,400,000                   $ 73,200,000
Real Estate Investment Property, Accumulated Depreciation 1,878,681,000 1,745,462,000           57,200,000 19,200,000 7,300,000     8,100,000 6,800,000          
Impairment of Real Estate 59,600,000       25,200,000 4,200,000                          
Fair Value of Real Estate $ 217,529,000 $ 52,505,000   $ 19,700,000 $ 158,600,000 $ 102,000,000                          
[1] Gross leasable area ("GLA")