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Note 10 - Stockholders' Equity - Dividends Declared (Details) - $ / shares		12 Months Ended
	Jun. 24, 2021	Dec. 31, 2021	Dec. 31, 2020
Series D Preferred Stock [Member]
Distributions Declared (in dollars per share)	$ 0.10417	$ 1.27603	$ 0
Series D Preferred Stock [Member] | Dividends Declared, January [Member]
Distributions Declared (in dollars per share)		0	0
Series D Preferred Stock [Member] | Dividends Declared, February [Member]
Distributions Declared (in dollars per share)		0	0
Series D Preferred Stock [Member] | Dividends Declared, March [Member]
Distributions Declared (in dollars per share)		0	0
Series D Preferred Stock [Member] | Dividends Declared, April [Member]
Distributions Declared (in dollars per share)		0	0
Series D Preferred Stock [Member] | Dividends Declared, May [Member]
Distributions Declared (in dollars per share)		0	0
Series D Preferred Stock [Member] | Dividends Declared, June [Member]
Distributions Declared (in dollars per share)		0.10417	0
Series D Preferred Stock [Member] | Dividends Declared, July [Member]
Distributions Declared (in dollars per share)		0.19531	0
Series D Preferred Stock [Member] | Dividends Declared, August [Member]
Distributions Declared (in dollars per share)		0.19531	0
Series D Preferred Stock [Member] | Dividends Declared, September [Member]
Distributions Declared (in dollars per share)		0.19531	0
Series D Preferred Stock [Member] | Dividends Declared, October [Member]
Distributions Declared (in dollars per share)		0.19531	0
Series D Preferred Stock [Member] | Dividends Declared, November [Member]
Distributions Declared (in dollars per share)		0.19531	0
Series D Preferred Stock [Member] | Dividends Declared, December [Member]
Distributions Declared (in dollars per share)		0.19531	0
Common Class A [Member]
Cash Dividend Declared (in dollars per share)		0.410	0.100
Common Class A [Member] | Dividends Declared, March 31 [Member]
Cash Dividend Declared (in dollars per share)		0.101	0
Common Class A [Member] | Dividends Declared, June 30 [Member]
Cash Dividend Declared (in dollars per share)		0.102	0
Common Class A [Member] | Dividends Declared, September 30 [Member]
Cash Dividend Declared (in dollars per share)		0.103	0
Common Class A [Member] | Dividends Declared, December31 [Member]
Cash Dividend Declared (in dollars per share)		$ 0.104	$ 0.100

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 http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770

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+ References

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