Note 6 - Dividends (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Common Stock, Dividends, Per Share, Declared	$ 0.06	$ 0.06	$ 0.12	$ 0.12
Payments of Ordinary Dividends, Common Stock			$ 9,752	$ 9,843
Paid Quarterly [Member]
Common Stock, Dividends, Per Share, Declared			$ 0.06	$ 0.06
Payments of Ordinary Dividends, Common Stock			$ 9,800	$ 9,800