Note 10 - Cash Dividends (Details Textual) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	9 Months Ended
	Apr. 30, 2022	Mar. 31, 2022	Mar. 31, 2021
Payments of Dividends, Total		$ 4.0	$ 4.0
Dividends Accrued		$ 0.1	$ 0.1
Annual Indicated per Share Dividend Rate (in dollars per share)		$ 0.20
Subsequent Event [Member]
Quarterly Indicated Per Share Dividend Rate (in dollars per share)	$ 0.05
Dividends Payable, Date to be Paid	May 17, 2022
Dividends Payable, Date of Record	May 09, 2022