Note 6 - Dividends (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Common Stock, Dividends, Per Share, Declared	$ 0.06	$ 0.06	$ 0.18	$ 0.18
Payments of Ordinary Dividends, Common Stock			$ 14,630	$ 14,709
Paid Quarterly [Member]
Common Stock, Dividends, Per Share, Declared			$ 0.06	$ 0.06
Payments of Ordinary Dividends, Common Stock			$ 14,600	$ 14,700