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Note 15 - Stockholders' Equity - Dividends Declared (Details) - $ / shares | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Common Shares (in dollars per share) | $ 0.23000 | $ 0.19000
Series L Preferred Stock [Member] |  |
Preferred Shares (in dollars per share) | 0.32031 | 0.32031
Series M Preferred Stock [Member] |  |
Preferred Shares (in dollars per share) | $ 0.32813 | $ 0.32813

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480008/505-10-S99-1 + Details
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- Definition Aggregate dividends declared during the period for each share of preferred stock outstanding. + References No definition available. + Details
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- Details
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