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Note 10 - Stockholders' Equity - Dividends Declared (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Common Class A [Member] |  |
Cash Dividend Declared (in dollars per share) | $ 0.091 | $ 0.252
Common Class A [Member] | Dividends Declared, March 31 [Member] |  |
Cash Dividend Declared (in dollars per share) | 0.022 | 0.105
Common Class A [Member] | Dividends Declared, June [Member] |  |
Cash Dividend Declared (in dollars per share) | 0.023 | 0.106
Common Class A [Member] | Dividends Declared, September 30 [Member] |  |
Cash Dividend Declared (in dollars per share) | 0.023 | 0.02
Common Class A [Member] | Dividends Declared, December31 [Member] |  |
Cash Dividend Declared (in dollars per share) | 0.023 | 0.021
Series D Preferred Stock [Member] |  |
Distributions Declared (in dollars per share) | 2.34372 | 2.34372
Series D Preferred Stock [Member] | Dividends Declared, January [Member] |  |
Distributions Declared (in dollars per share) | 0.19531 | 0.19531
Series D Preferred Stock [Member] | Dividends Declared, June [Member] |  |
Distributions Declared (in dollars per share) | 0.19531 | 0.19531
Series D Preferred Stock [Member] | Dividends Declared, February [Member] |  |
Distributions Declared (in dollars per share) | 0.19531 | 0.19531
Series D Preferred Stock [Member] | Dividends Declared, March [Member] |  |
Distributions Declared (in dollars per share) | 0.19531 | 0.19531
Series D Preferred Stock [Member] | Dividends Declared, December31 [Member] |  |
Distributions Declared (in dollars per share) | 0.19531 | 0.19531
Series D Preferred Stock [Member] | Dividends Declared, April [Member] |  |
Distributions Declared (in dollars per share) | 0.19531 | 0.19531
Series D Preferred Stock [Member] | Dividends Declared, May [Member] |  |
Distributions Declared (in dollars per share) | 0.19531 | 0.19531
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

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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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