Note 9 - Cash Dividends (Details Textual) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Nov. 30, 2022
Payments of Dividends, Total	$ 1.4	$ 1.3
Dividends Accrued	$ 0.2	$ 0.1
Annual Indicated per Share Dividend Rate	$ 0.20
Subsequent Event [Member]
Quarterly Indicated Per Share Dividend Rate			$ 0.05