Note 9 - Cash Dividends (Details Textual) - USD ($) $ / shares in Units, $ in Millions		12 Months Ended
	Sep. 07, 2021	Jun. 30, 2021	Jun. 30, 2020
Payments of Dividends, Total		$ 5.3	$ 5.3
Dividends Accrued		$ 0.1
Subsequent Event [Member]
Quarterly Indicated Per Share Dividend Rate (in dollars per share)	$ 0.05
Dividends Payable, Date to be Paid	Sep. 07, 2021
Dividends Payable, Date of Record	Aug. 30, 2021