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Note 10 - Stockholders' Equity - Dividends Declared (Details) - $ / shares	12 Months Ended
	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

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
-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

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+ References

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