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Note 11 - Stockholders' Equity - Dividends Declared (Details) - $ / shares | 9 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023
Common Class A [Member] |  |
Cash Dividend Declared (in dollars per share) | $ 0 | $ 0.045
Common Class A [Member] | O 2024 Q1 Dividends [Member] |  |
Cash Dividend Declared (in dollars per share) | 0 |
Common Class A [Member] | O 2023 Q1 Dividends [Member] |  |
Cash Dividend Declared (in dollars per share) |  | 0.022
Common Class A [Member] | O 2024 Q2 Dividends [Member] |  |
Cash Dividend Declared (in dollars per share) | 0 |
Common Class A [Member] | O 2023 Q2 Dividends [Member] |  |
Cash Dividend Declared (in dollars per share) |  | 0.023
Common Class A [Member] | O 2024 Q3 Dividends [Member] |  |
Cash Dividend Declared (in dollars per share) | 0 |
Common Class A [Member] | O 2023 Q3 Dividends [Member] |  |
Cash Dividend Declared (in dollars per share) |  | 0.023
Series D Preferred Stock [Member] |  |
Distributions Declared (in dollars per share) | 1.75779 | 1.75779
Series D Preferred Stock [Member] | O 2024 M1 Dividends [Member] |  |
Distributions Declared (in dollars per share) | 0.19531 |
Series D Preferred Stock [Member] | O 2023 M1 Dividends [Member] |  |
Distributions Declared (in dollars per share) |  | 0.19531
Series D Preferred Stock [Member] | O 2024 M2 Dividends [Member] |  |
Distributions Declared (in dollars per share) | 0.19531 |
Series D Preferred Stock [Member] | O 2023 M2 Dividends [Member] |  |
Distributions Declared (in dollars per share) |  | 0.19531
Series D Preferred Stock [Member] | O 2024 M3 Dividends [Member] |  |
Distributions Declared (in dollars per share) | 0.19531 |
Series D Preferred Stock [Member] | O 2023 M3 Dividends [Member] |  |
Distributions Declared (in dollars per share) |  | 0.19531
Series D Preferred Stock [Member] | O 2024 M4 Dividends [Member] |  |
Distributions Declared (in dollars per share) | 0.19531 |
Series D Preferred Stock [Member] | O 2023 M4 Dividends [Member] |  |
Distributions Declared (in dollars per share) |  | 0.19531
Series D Preferred Stock [Member] | O 2024 M5 Dividends [Member] |  |
Distributions Declared (in dollars per share) | 0.19531 |
Series D Preferred Stock [Member] | O 2023 M5 Dividends [Member] |  |
Distributions Declared (in dollars per share) |  | 0.19531
Series D Preferred Stock [Member] | O 2024 M6 Dividends [Member] |  |
Distributions Declared (in dollars per share) | 0.19531 |
Series D Preferred Stock [Member] | O 2023 M6 Dividends [Member] |  |
Distributions Declared (in dollars per share) |  | 0.19531
Series D Preferred Stock [Member] | O 2024 M7 Dividends [Member] |  |
Distributions Declared (in dollars per share) | 0.19531 |
Series D Preferred Stock [Member] | O 2023 M7 Dividends [Member] |  |
Distributions Declared (in dollars per share) |  | 0.19531
Series D Preferred Stock [Member] | O 2024 M8 Dividends [Member] |  |
Distributions Declared (in dollars per share) | 0.19531 |
Series D Preferred Stock [Member] | O 2023 M8 Dividends [Member] |  |
Distributions Declared (in dollars per share) |  | 0.19531
Series D Preferred Stock [Member] | O 2024 M9 Dividends [Member] |  |
Distributions Declared (in dollars per share) | $ 0.19531 |
Series D Preferred Stock [Member] | O 2023 M9 Dividends [Member] |  |
Distributions Declared (in dollars per share) |  | $ 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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