Note 4 - Investments - Unrealized Gains and Losses (Details) - USD ($) $ in Thousands		12 Months Ended
		Jun. 30, 2022	Jun. 30, 2021
Net gains (losses) recognized during the period on equity securities		$ (7,527)	$ 26,475
Less: Net gains (losses) recognized during the period on equity securities sold during the period		(178)	(20,585)
Net unrealized gains (losses) recognized during the reporting period on equity securities still held at the reporting date1	[1]	$ (7,705)	$ 5,890

[1] Included $187,000 for the year ended June 30, 2022, of net gains (losses) as a result of the measurement alternative. There were net gains (losses) of $1.4 million as a result of the measurement alternative for the year ended June 30, 2021.