Note 28 - Subsequent Events (Details Textual) $ / shares in Units, ft² in Thousands, $ in Thousands			1 Months Ended		12 Months Ended
	Feb. 01, 2024 USD ($)	Jan. 02, 2024 USD ($) ft² $ / shares shares	Feb. 28, 2024 USD ($) shares	Jan. 31, 2024 USD ($) shares	Dec. 31, 2023 USD ($) ft² $ / shares shares	Dec. 31, 2022 USD ($) ft² $ / shares shares	Dec. 31, 2021 USD ($)
Gross Leasable Area (Square Foot) | ft²					1,145	934
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares					$ 1	$ 1
Preferred Stock, Liquidation Preference, Value					$ 484,179	$ 485,868
Business Combination, Acquisition Related Costs					4,766	(0)	$ 50,191
Proceeds from Sale and Maturity of Marketable Securities					$ 292,552	$ 302,504	$ 377
Share Repurchase Program [Member]
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares					$ 1
Class L Cumulative Redeemable Preferred Stock Depositary Shares[Member] | Maximum [Member] | Share Repurchase Program [Member]
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares) | shares					894,000
Class M Cumulative Redeemable Preferred Stock Depositary Shares [Member] | Maximum [Member] | Share Repurchase Program [Member]
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares) | shares					1,048,000
Albertsons Companies, Inc [Member]
Sale of Marketable Securities (in shares) | shares					14,100,000	11,500,000
Proceeds from Sale and Maturity of Marketable Securities					$ 282,300	$ 301,100
Equity Securities, FV-NI, Realized Gain (Loss)					241,200	251,500
Equity Securities, Taxes Paid on Capital Gains					60,900	$ 57,200
RPT [Member]
Business Combination, Acquisition Related Costs					$ 4,800
Subsequent Event [Member]
Number of Real Estate Properties		523
Subsequent Event [Member] | Unsecured Term Loan Credit Facility [Member]
Debt Instrument, Face Amount		$ 200,000
Subsequent Event [Member] | Unsecured Term Loan Credit Facility [Member] | Secured Overnight Financing Rate (SOFR) [Member]
Debt Instrument, Basis Spread on Variable Rate		0.85%
Subsequent Event [Member] | Unsecured Term Loan Credit Facility [Member] | Base Rate [Member]
Debt Instrument, Basis Spread on Variable Rate		0.00%
Subsequent Event [Member] | Senior Unsecured Notes [Member]
Repayments of Long-Term Debt				$ 246,200
Debt Instrument, Interest Rate, Stated Percentage				4.45%
Subsequent Event [Member] | Kimco OP [Member]
Subsidiary, Ownership Percentage, Parent		99.86%
Subsequent Event [Member] | Class N Cumulative Convertible Preferred Stock Depositary Shares [Member] | Share Repurchase Program [Member]
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares) | shares				185,000
Subsequent Event [Member] | Class N Cumulative Convertible Preferred Stock Depositary Shares [Member] | Maximum [Member] | Share Repurchase Program [Member]
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares) | shares				185,000
Subsequent Event [Member] | Class L Cumulative Redeemable Preferred Stock Depositary Shares[Member] | Share Repurchase Program [Member]
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares) | shares				891,000
Subsequent Event [Member] | Class L Cumulative Redeemable Preferred Stock Depositary Shares[Member] | Maximum [Member] | Share Repurchase Program [Member]
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares) | shares				891,000
Subsequent Event [Member] | Class M Cumulative Redeemable Preferred Stock Depositary Shares [Member] | Share Repurchase Program [Member]
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares) | shares				1,047,000
Subsequent Event [Member] | Class M Cumulative Redeemable Preferred Stock Depositary Shares [Member] | Maximum [Member] | Share Repurchase Program [Member]
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares) | shares				1,047,000
Subsequent Event [Member] | Albertsons Companies, Inc [Member]
Sale of Marketable Securities (in shares) | shares			14,200,000
Proceeds from Sale and Maturity of Marketable Securities			$ 299,100
Equity Securities, FV-NI, Realized Gain (Loss)	$ 288,700
Equity Securities, Taxes Paid on Capital Gains	$ 72,900
Subsequent Event [Member] | RPT [Member]
Number of Properties Acquired		56
Gross Leasable Area (Square Foot) | ft²		13,300
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares Per Each Acquired Company Share (in shares) | shares		0.6049
Business Combination, Acquisition Related Costs		$ 18,900
Payments to Acquire Businesses, Fractional Shares		100
Subsequent Event [Member] | RPT [Member] | Senior Notes [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-Term Debt		$ 511,500
Subsequent Event [Member] | RPT [Member] | Senior Notes [Member] | Minimum [Member]
Debt Instrument, Interest Rate, Stated Percentage		3.64%
Subsequent Event [Member] | RPT [Member] | Senior Notes [Member] | Maximum [Member]
Debt Instrument, Interest Rate, Stated Percentage		4.74%
Subsequent Event [Member] | RPT [Member] | Unsecured Debt [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-Term Debt		$ 310,000
Subsequent Event [Member] | RPT [Member] | Unsecured Debt [Member] | Secured Overnight Financing Rate (SOFR) [Member]
Debt Instrument, Basis Spread on Variable Rate		0.905%
Subsequent Event [Member] | RPT [Member] | Unsecured Debt [Member] | Minimum [Member]
Debt Instrument, Interest Rate, Stated Percentage		4.674%
Subsequent Event [Member] | RPT [Member] | Unsecured Debt [Member] | Maximum [Member]
Debt Instrument, Interest Rate, Stated Percentage		4.875%
Subsequent Event [Member] | RPT [Member] | Unsecured Term Loan Maturing 2026 [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-Term Debt		$ 50,000
Subsequent Event [Member] | RPT [Member] | Unsecured term Loan Maturing 2027 [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-Term Debt		100,000
Subsequent Event [Member] | RPT [Member] | Second Unsecured Term Loan Maturing 2027 [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-Term Debt		50,000
Subsequent Event [Member] | RPT [Member] | Unsecured Term Loan Maturing 2028 [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-Term Debt		110,000
Subsequent Event [Member] | RPT [Member] | Line of Credit [Member]
Repayments of Long-Term Debt		$ 130,000
Subsequent Event [Member] | RPT [Member] | Series D Cumulative Convertible Perpetual Preferred Shares [Member]
Preferred Stock, Dividend Rate, Percentage		7.25%
Business Combination, Preferred Share Right to be Converted to Depository Share (in shares) | shares		0.001
Subsequent Event [Member] | RPT [Member] | Class N Preferred Stock [Member]
Stock Issued During Period, Shares, Acquisitions (in shares) | shares		1,849
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares		$ 1
Preferred Stock, Liquidation Preference, Value		$ 92,400
Subsequent Event [Member] | RPT [Member] | Class N Cumulative Convertible Preferred Stock Depositary Shares [Member]
Stock Issued During Period, Shares, Acquisitions (in shares) | shares		1,848,539
Preferred Stock, Liquidation Preference Per Share (in dollars per share) | $ / shares		$ 50
Preferred Stock, Dividend Rate, Per-Dollar-Amount (in dollars per share) | $ / shares		$ 3.625
Convertible Preferred Stock, Shares Issued upon Conversion (in shares) | shares		2.3071
Subsequent Event [Member] | RPT [Member] | Property Net Lease Joint Venture [Member]
Number of Properties Acquired		49
Business Acquisition, Percentage of Voting Interests Acquired		6.00%
Subsequent Event [Member] | RPT [Member] | Wholly Owned Properties [Member]
Number of Properties Acquired		43
Subsequent Event [Member] | RPT [Member] | Consolidated Properties [Member]
Number of Properties Acquired		13