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Note 4 - Real Estate Under Development (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Sep. 30, 2017
Apr. 01, 2017
SEC Schedule III, Real Estate, Cost of Real Estate Sold $ 315,954,464 $ 391,758,149 $ 507,185,370    
Real Estate Investment Property, Net 9,817,875,000 9,394,755,000      
Payments to Acquire Real Estate 153,854,000 203,190,000 $ 661,423,000    
Real Estate Inventory, Capitalized Interest Costs Incurred 11,000,000 6,900,000      
Real Estate Development Projects, Real Estate Taxes and Insurance Capitalized 5,700,000 5,200,000      
Real Estate Development Projects, Payroll Costs Capitalized 3,300,000 1,800,000      
Payments to Acquire Businesses, Gross $ 325,228,000 [1] $ 255,910,000 [2]      
KIM Lincoln, LLC [Member]          
Ownership Interest in Joint Venture, Percentage 90.00%        
Lincoln Square Property, LP [Member]          
Ownership Interest in Joint Venture, Percentage 10.00%        
Grand Parkway Marketplace [Member]          
SEC Schedule III, Real Estate, Cost of Real Estate Sold $ 2,900,000        
Real Estate Investment Property, Net       $ 91,000,000  
Avenues Walk [Member]          
Real Estate Investment Property, Net         $ 24,500,000
Real Estate Under Development [Member]          
Number of Real Estate Properties 4        
Payments to Acquire Real Estate $ 10,000,000        
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage   55.00%      
Payments to Acquire Businesses, Gross   $ 84,200,000      
Real Estate Properties, Future Development [Member]          
Number of Real Estate Properties 2        
Acquired Land [Member]          
Number of Real Estate Properties   3      
Payments to Acquire Real Estate   $ 13,800,000      
[1] The Company utilized an aggregate $162.4 million associated with Internal Revenue Code 1031 sales proceeds.
[2] The Company utilized an aggregate $66.0 million associated with Internal Revenue Code 1031 sales proceeds.