Note 9 - Cash Dividends (Details Textual) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended
	Nov. 30, 2023	Sep. 30, 2023	Sep. 30, 2022
Payments of Dividends, Total		$ 1.4	$ 1.4
Dividends Accrued		$ 0.1	$ 0.2
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	Nov. 21, 2023
Dividends Payable, Date of Record	Nov. 13, 2023