Note 2 - Investments - Carrying Value of Equity Securities Without Readily Determinable Fair Values (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022	Jun. 30, 2022
Statement [Line Items]
Other investments	$ 2,827	$ 4,208	$ 2,827	$ 4,208	$ 3,992
Upward carrying value changes	9	187	14	187
Downward carrying value changes/impairment	$ 0	$ 0	$ (1,841)	$ 0