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Note 15 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Millions | 6 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2022 | Dec. 31, 2021 | Aug. 31, 2021 | Feb. 28, 2020
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 |
Sales of Stock Maximum Sales Price |  |  | $ 500.0 |
Stock Issued During Period, Shares, New Issues (in shares) | 450,000 |  |  |
Proceeds from Issuance of Common Stock | $ 11.3 |  |  |
Common Stock Available for Issuance, Value | $ 411.0 |  |  |
Class L Cumulative Redeemable Preferred Stock Depositary Shares[Member] |  |  |  |
Stock Repurchased During Period, Shares (in shares) | 54,508 |  |  |
Class M Cumulative Redeemable Preferred Stock Depositary Shares [Member] |  |  |  |
Stock Repurchased During Period, Shares (in shares) | 90,760 |  |  |
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) | 1,958 |  |  |
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) | 900,000 |  |  |
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) | 1,058,000 |  |  |

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