Note 17 - Stockholders' Equity (Details Textual) $ / shares in Units, $ in Millions			1 Months Ended	3 Months Ended
		Jan. 02, 2024 USD ($) $ / shares shares	Sep. 30, 2023 USD ($) $ / shares	Mar. 31, 2024 USD ($) $ / shares shares	Mar. 31, 2023 shares	Jan. 31, 2024 shares	Dec. 31, 2023 $ / shares
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares				$ 1			$ 1
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares				$ 0.01			$ 0.01
ATM Program [Member]
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares			$ 0.01
Maximum Aggregate Sales Price | $			$ 500.0
Stock Issued During Period, Shares, New Issues (in shares)				0
Common Stock Available for Issuance, Value | $				$ 500.0
Preferred Stock [Member]
Stock Issued During Period, Shares, New Issues (in shares)				0	0
Share Repurchase Program [Member]
Stock Repurchased During Period, Shares (in shares)				0
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares				$ 0.01
Stock Repurchase Program, Authorized Amount | $				$ 300.0
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $				$ 224.9
Share Repurchase Program [Member] | Preferred Stock [Member]
Stock Repurchased During Period, Shares (in shares)				0
Class N Preferred Stock [Member]
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares	[1]			$ 1
Class N Cumulative Convertible Preferred Stock Depositary Shares [Member] | Share Repurchase Program [Member]
Share Repurchase Program, Authorized, Number of Shares (in shares)						185,000
Class L Cumulative Redeemable Preferred Stock Depositary Shares[Member] | Share Repurchase Program [Member]
Share Repurchase Program, Authorized, Number of Shares (in shares)						891,000
Class M Cumulative Redeemable Preferred Stock Depositary Shares [Member] | Share Repurchase Program [Member]
Share Repurchase Program, Authorized, Number of Shares (in shares)						1,047,000
RPT [Member]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares Per Each Acquired Company Share (in shares)		0.6049
RPT [Member] | Conversion of RPT Realty Shares Into Kimco Common Shares [Member]
Stock Issued During Period, Shares, Acquisitions (in shares)		53,000,000
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares Per Each Acquired Company Share (in shares)		0.6049
RPT [Member] | Class N Preferred Stock [Member]
Stock Issued During Period, Shares, Acquisitions (in shares)		1,849
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares		$ 1
Stock Issued During Period, Value, Acquisitions | $		$ 105.6
Preferred Stock, Convertible, Conversion Ratio		2.3071
Convertible Preferred Stock, Shares Issued upon Conversion (in shares)		4,300,000
RPT [Member] | Class N Cumulative Convertible Preferred Stock Depositary Shares [Member]
Stock Issued During Period, Shares, Acquisitions (in shares)		1,848,539

[1] In connection with the RPT Merger, the Company issued 1,849 shares of Class N Cumulative Convertible Perpetual Preferred Shares with a par value of $1.00 per share, represented by 1,848,539 depositary shares, which had a fair market value of $105.6 million. The Class N Preferred Stock depositary shares are convertible at any time by the holders to 2.3071 of the Company’s common shares or under certain circumstances by the Company’s election. As of March 31, 2024, the Class N Preferred Stock was potentially convertible into 4.3 million shares of common stock.