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Note 17 - Preferred Stock, Common Stock and Convertible Unit Transactions - Outstanding Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Preferred stock, shares authorized (in shares) | 7,054,000 | 7,054,000
Preferred stock, liquidation preference | $ 489.5 | $ 489.5
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 |
Shares issued and outstanding (in shares) | 9,000 |
Preferred stock, liquidation preference | $ 225.0 |
Dividend rate | 5.125% |
Annual dividend per depository share (in dollars per share) | $ 1.28125 |
Preferred stock, par value (in dollars per share) | $ 1.00 |
Series M Preferred Stock [Member] |  |
Preferred stock, shares authorized (in shares) | 10,580 |
Shares issued and outstanding (in shares) | 10,580 |
Preferred stock, liquidation preference | $ 264.5 |
Dividend rate | 5.25% |
Annual dividend per depository share (in dollars per share) | $ 1.31250 |
Preferred stock, par value (in dollars per share) | $ 1.00 |
Total [Member] |  |
Shares issued and outstanding (in shares) | 19,580 |
Preferred stock, liquidation preference | $ 489.5 |

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