Note 6 - Dividends (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
Mar. 31, 2024	Mar. 31, 2023
Common Stock, Dividends, Per Share, Declared	$ 0.06	$ 0.06
Payments of Ordinary Dividends, Common Stock	$ 4,881	$ 4,874
Paid Quarterly [Member]
Common Stock, Dividends, Per Share, Declared	$ 0.06	$ 0.06
Payments of Ordinary Dividends, Common Stock	$ 4,900	$ 4,900

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