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Note 15 - Stockholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 2022
Notes Tables |
Class of Treasury Stock [Table Text Block] |
Class of Preferred Stock |  | Depositary Shares Repurchased |  |  | Purchase Price (in millions) |
Class L |  |  | 54,508 |  |  | $ | 1.3 |
Class M |  |  | 90,760 |  |  | $ | 2.1 |
Schedule of Stockholders Equity [Table Text Block] |
As of June 30, 2022
Class of Preferred Stock |  | Shares Authorized |  |  | Shares Issued and Outstanding |  |  | Liquidation Preference (in thousands) |  |  | Dividend Rate |  |  | Annual Dividend per Depositary Share |  |  | Par Value |  | Optional Redemption Date
Class L |  |  | 10,350 |  |  |  | 8,946 |  |  | $ | 223,637 |  |  |  | 5.125 | % |  | $ | 1.28125 |  |  | $ | 1.00 |  | 8/16/2022
Class M |  |  | 10,580 |  |  |  | 10,489 |  |  |  | 262,231 |  |  |  | 5.250 | % |  | $ | 1.31250 |  |  | $ | 1.00 |  | 12/20/2022
|  |  |  |  |  |  | 19,435 |  |  | $ | 485,868 |  |  |  |  |  |  |  |  |  |  |  |  |  |
As of December 31, 2021
Class of Preferred Stock |  | Shares Authorized |  |  | Shares Issued and Outstanding |  |  | Liquidation Preference (in thousands) |  |  | Dividend Rate |  |  | Annual Dividend per Depositary Share |  |  | Par Value |  | Optional Redemption Date
Class L |  |  | 10,350 |  |  |  | 9,000 |  |  | $ | 225,000 |  |  |  | 5.125 | % |  | $ | 1.28125 |  |  | $ | 1.00 |  | 8/16/2022
Class M |  |  | 10,580 |  |  |  | 10,580 |  |  |  | 264,500 |  |  |  | 5.250 | % |  | $ | 1.31250 |  |  | $ | 1.00 |  | 12/20/2022
|  |  |  |  |  |  | 19,580 |  |  | $ | 489,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Declared [Table Text Block] |
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
Common Shares |  | $ | 0.20000 |  |  | $ | 0.17000 |  |  | $ | 0.39000 |  |  | $ | 0.34000 |
Class L Depositary Shares |  | $ | 0.32031 |  |  | $ | 0.32031 |  |  | $ | 0.64062 |  |  | $ | 0.64062 |
Class M Depositary Shares |  | $ | 0.32813 |  |  | $ | 0.32813 |  |  | $ | 0.65626 |  |  | $ | 0.65626 |

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