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Note 15 - Stockholders' Equity - Dividends Declared (Details) - $ / shares | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Common Shares (in dollars per share) | $ 0.17000 | $ 0 | $ 0.34000 | $ 0.28000
Series L Preferred Stock [Member] |  |  |  |
Preferred Shares (in dollars per share) | 0.32031 | 0.32031 | 0.64062 | 0.64062
Series M Preferred Stock [Member] |  |  |  |
Preferred Shares (in dollars per share) | $ 0.32813 | $ 0.32813 | $ 0.65626 | $ 0.65626

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 + 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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