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Note 15 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2023 | Dec. 31, 2022
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ 1.00 | $ 1.00
Common Stock, Par or Stated Value Per Share (in dollars per share) | 0.01 | $ 0.01
ATM Program [Member] |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ 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 |
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 |
Share Repurchase Program [Member] |  |
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ 1.00 |
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ 0.01 |
Stock Repurchase Program, Authorized Amount | $ 300.0 |
Stock Repurchased During Period, Shares (in shares) | 0 |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 224.9 |
Share Repurchase Program [Member] | Maximum [Member] |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares) | 1,942 |
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 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 |

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