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Note 10 - Stockholders' Equity - Dividends Declared (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Common Class A [Member] |  |
Cash Dividend Declared (in dollars per share) | $ 0.252 | $ 0.410
Common Class A [Member] | Dividends Declared, March 31 [Member] |  |
Cash Dividend Declared (in dollars per share) | 0.105 | 0.101
Common Class A [Member] | Dividends Declared, June 30 [Member] |  |
Cash Dividend Declared (in dollars per share) | 0.106 | 0.102
Common Class A [Member] | Dividends Declared, September 30 [Member] |  |
Cash Dividend Declared (in dollars per share) | 0.020 | 0.103
Common Class A [Member] | Dividends Declared, December31 [Member] |  |
Cash Dividend Declared (in dollars per share) | 0.021 | 0.104
Series D Preferred Stock [Member] |  |
Distributions Declared (in dollars per share) | 2.34372 | 1.27603
Series D Preferred Stock [Member] | Dividends Declared, January [Member] |  |
Distributions Declared (in dollars per share) | 0.19531 | 0
Series D Preferred Stock [Member] | Dividends Declared, February [Member] |  |
Distributions Declared (in dollars per share) | 0.19531 | 0
Series D Preferred Stock [Member] | Dividends Declared, March [Member] |  |
Distributions Declared (in dollars per share) | 0.19531 | 0
Series D Preferred Stock [Member] | Dividends Declared, April [Member] |  |
Distributions Declared (in dollars per share) | 0.19531 | 0
Series D Preferred Stock [Member] | Dividends Declared, May [Member] |  |
Distributions Declared (in dollars per share) | 0.19531 | 0
Series D Preferred Stock [Member] | Dividends Declared, June [Member] |  |
Distributions Declared (in dollars per share) | 0.19531 | 0.10417
Series D Preferred Stock [Member] | Dividends Declared, July [Member] |  |
Distributions Declared (in dollars per share) | 0.19531 | 0.19531
Series D Preferred Stock [Member] | Dividends Declared, August [Member] |  |
Distributions Declared (in dollars per share) | 0.19531 | 0.19531
Series D Preferred Stock [Member] | Dividends Declared, September [Member] |  |
Distributions Declared (in dollars per share) | 0.19531 | 0.19531
Series D Preferred Stock [Member] | Dividends Declared, October [Member] |  |
Distributions Declared (in dollars per share) | 0.19531 | 0.19531
Series D Preferred Stock [Member] | Dividends Declared, November [Member] |  |
Distributions Declared (in dollars per share) | 0.19531 | 0.19531
Series D Preferred Stock [Member] | Dividends Declared, December [Member] |  |
Distributions Declared (in dollars per share) | $ 0.19531 | $ 0.19531

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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 https://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 + Details
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