Note 2 - Dividends (Details Textual) - $ / shares		3 Months Ended	6 Months Ended
May 10, 2023	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Common Stock, Dividends, Per Share, Declared (in dollars per share)	$ 0.27	$ 0.27	$ 0.27	$ 0.54	$ 0.54

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

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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Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration