Note 9 - Cash Dividends (Details Textual) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	6 Months Ended
	Jan. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Payments of Dividends, Total		$ 2.7	$ 2.7
Annual Indicated per Share Dividend Rate		$ 0.20
Subsequent Event [Member]
Quarterly Indicated Per Share Dividend Rate	$ 0.05
Dividends Payable, Date to be Paid	May 17, 2022
Dividends Payable, Date of Record	May 09, 2022