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Note 15 - Stockholders' Equity - Outstanding Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2022
Preferred stock, shares authorized (in shares) | 7,054,000 | 7,054,000 |
Preferred stock, liquidation preference | $ 485,536 | $ 489,868 |
Preferred stock, par value (in dollars per share) | $ 1.00 | $ 1.00 |
Series L Preferred Stock [Member] |  |  |
Preferred stock, shares authorized (in shares) | 10,350 | 10,350 |
Shares issued and outstanding (in shares) | 8,940 | 8,946 |
Preferred stock, liquidation preference | $ 223,499 | $ 223,637 |
Dividend rate | 5.125% | 5.125% |
Annual dividend per depository share (in dollars per share) | $ 1.28125 | $ 1.28125 |
Preferred stock, par value (in dollars per share) |  | $ 1.00 | $ 1.00
Series M Preferred Stock [Member] |  |  |
Preferred stock, shares authorized (in shares) | 10,580 | 10,580 |
Shares issued and outstanding (in shares) | 10,481 | 10,489 |
Preferred stock, liquidation preference | $ 262,037 | $ 262,231 |
Dividend rate | 5.25% | 5.25% |
Annual dividend per depository share (in dollars per share) | $ 1.31250 | $ 1.31250 |
Preferred stock, par value (in dollars per share) |  | $ 1.00 | $ 1.00
Redeemable Preferred Stock [Member] |  |  |
Shares issued and outstanding (in shares) | 19,421 | 19,435 |
Preferred stock, liquidation preference | $ 485,536 | $ 485,868 |

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