Note 10 - Cash Dividends (Details Textual) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Nov. 23, 2021	Sep. 30, 2021	Sep. 30, 2020
Payments of Dividends, Total		$ 1.3	$ 1.3
Dividends Accrued		$ 0.1
Subsequent Event [Member]
Quarterly Indicated Per Share Dividend Rate (in dollars per share)	$ 0.05
Annual Indicated per Share Dividend Rate (in dollars per share)	$ 0.20
Dividends Payable, Date to be Paid	Nov. 23, 2021
Dividends Payable, Date of Record	Nov. 15, 2021