Note 4 - Investments - Unrealized Gains and Losses (Details) - USD ($) $ in Thousands		12 Months Ended
		Jun. 30, 2023	Jun. 30, 2022
Net gains and losses recognized during the period on equity securities		$ (3,016)	$ (7,527)
Less: Net gains and losses recognized during the period on equity securities sold during the period		(13)	178
Unrealized gains and losses recognized during the reporting period on equity securities still held at the reporting date 1	[1]	$ (3,003)	$ (7,705)

[1] Included $2.3 million for the fiscal year ended June 30, 2023, of net losses as a result of the measurement alternative. There were net gains of $187,000 as a result of the measurement alternative for the year ended June 30, 2022