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Note 10 - Stockholders' Equity - Dividends Declared (Details) - $ / shares	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Common Class A [Member]
Cash Dividend Declared (in dollars per share)	$ 0.022	$ 0.105
Common Class A [Member] | Dividends Declared, March 31 [Member]
Cash Dividend Declared (in dollars per share)	0.022	0.105
Series D Preferred Stock [Member]
Distributions Declared (in dollars per share)	0.58593	0.58593
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, 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

X

- 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

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- Definition

Aggregate dividends declared during the period for each share of preferred stock outstanding.

+ References

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