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Note 18 - Preferred Stock, Common Stock and Convertible Unit Transactions (Details Textual) $ / shares in Units, $ in Thousands |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2023 USD ($) $ / shares | Dec. 31, 2023 USD ($) $ / shares shares | Dec. 31, 2022 USD ($) $ / shares shares | Dec. 31, 2021 $ / shares shares | Jan. 31, 2024 shares | Feb. 28, 2020 USD ($) | Sep. 30, 2019 $ / 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 |  |  |  |
Stock Repurchased During Period, Shares (in shares) |  |  | 761,149 | 567,450 | 1,084,953 |  |  |
Equity, Attributable to Noncontrolling Interest | $ |  |  | $ 127,993 | $ 131,401 |  |  |  |
Common Stock, Dividends, Per Share, Declared (in dollars per share) | $ / shares | [1] |  | $ 1.02 | $ 0.84 | $ 0.68 |  |  |
Special Cash Dividend [Member] |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared (in dollars per share) | $ / shares |  |  | $ 0.09 |  |  |  |  |
ATM Program [Member] |  |  |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares |  | $ 0.01 |  |  |  |  |  | $ 0.01
Maximum Aggregate Sales Price | $ |  | $ 500,000 |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  | 0 |  |  |  |  |
Common Stock Available for Issuance, Value | $ |  |  | $ 500,000 |  |  |  |  |
Class L Cumulative Redeemable Preferred Stock Depositary Shares[Member] |  |  |  |  |  |  |  |
Stock Repurchased During Period, Shares (in shares) |  |  | 43,777 |  |  |  |  |
Class M Cumulative Redeemable Preferred Stock Depositary Shares [Member] |  |  |  |  |  |  |  |
Stock Repurchased During Period, Shares (in shares) |  |  | 23,791 |  |  |  |  |
Series I, J, K, L or M Preferred Stock [Member] |  |  |  |  |  |  |  |
Number of Votes |  |  | 1,000 |  |  |  |  |
Number of Proxies |  |  | 1,000 |  |  |  |  |
Number of Votes, Depositary |  |  | 1 |  |  |  |  |
Series L Preferred Stock [Member] |  |  |  |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares |  |  | $ 1 | 1 |  |  |  |
Preferred Stock, Liquidation Preference Per Share (in dollars per share) | $ / shares |  |  | 25,000 |  |  |  |  |
Series M Preferred Stock [Member] |  |  |  |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares |  |  | 1 | $ 1 |  |  |  |
Preferred Stock, Liquidation Preference Per Share (in dollars per share) | $ / shares |  |  | 25,000 |  |  |  |  |
Depositary Share [Member] |  |  |  |  |  |  |  |
Preferred Stock, Liquidation Preference Per Share (in dollars per share) | $ / shares |  |  | $ 25 |  |  |  |  |
Convertible Units [Member] |  |  |  |  |  |  |  |
Equity, Attributable to Noncontrolling Interest | $ |  |  | $ 51,200 |  |  |  |  |
Partners' Capital Account, Units, Converted (in shares) |  |  | 2,400,000 |  |  |  |  |
Share Repurchase Program [Member] |  |  |  |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares |  |  | $ 1 |  |  |  |  |
Stock Repurchase Program, Authorized Amount | $ |  |  |  |  |  |  | $ 300,000 |
Stock Repurchased During Period, Shares (in shares) |  |  | 0 | 0 |  |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ |  |  | $ 224,900 |  |  |  |  |
Share Repurchase Program [Member] | Class L Cumulative Redeemable Preferred Stock Depositary Shares[Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares) |  |  |  |  |  | 891,000 |  |
Share Repurchase Program [Member] | Class L Cumulative Redeemable Preferred Stock Depositary Shares[Member] | Maximum [Member] |  |  |  |  |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares) |  |  | 894,000 |  |  |  |  |
Share Repurchase Program [Member] | Class L Cumulative Redeemable Preferred Stock Depositary Shares[Member] | Maximum [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares) |  |  |  |  |  | 891,000 |  |
Share Repurchase Program [Member] | Class M Cumulative Redeemable Preferred Stock Depositary Shares [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares) |  |  |  |  |  | 1,047,000 |  |
Share Repurchase Program [Member] | Class M Cumulative Redeemable Preferred Stock Depositary Shares [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares) |  |  | 1,048,000 |  |  |  |  |
Share Repurchase Program [Member] | Class M Cumulative Redeemable Preferred Stock Depositary Shares [Member] | Maximum [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares) |  |  |  |  |  | 1,047,000 |  |
Share Repurchase Program [Member] | Cumulative Preferred Stock [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares) |  |  | 1,942 |  |  |  |  |
Share Repurchase Program [Member] | Class N Cumulative Convertible Preferred Stock Depositary Shares [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares) |  |  |  |  |  | 185,000 |  |
Share Repurchase Program [Member] | Class N Cumulative Convertible Preferred Stock Depositary Shares [Member] | Maximum [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares) |  |  |  |  |  | 185,000 |  |
[1] | During 2023, the Company’s Board of Directors declared a $0.09 per common share special cash dividend to maintain distribution requirements as a REIT.

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