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Note 10 - Stockholders' Equity - Dividends Declared (Details) - $ / shares	3 Months Ended				6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Common Class A [Member]
Cash Dividend Declared (in dollars per share)	$ 0.106	$ 0.105	$ 0.102	$ 0.101	$ 0.211	$ 0.203
Series D Preferred Stock [Member]
Distributions Declared (in dollars per share)					1.17186	0.10417
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

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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- Definition

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

+ References

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