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Note 14 - Stockholders' Equity - Outstanding Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021
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 |
Redeemable Preferred Stock [Member] |  |
Shares issued and outstanding (in shares) | 19,580 |
Preferred stock, liquidation preference | $ 489.5 |

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- Definition Value of the difference between preference in liquidation and the par or stated values of the preferred shares. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(d)) -URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (h) -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496158-112644 + Details
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