Note 4 - Investments - Unrealized Gains and Losses (Details) - USD ($) $ in Thousands		12 Months Ended
		Jun. 30, 2024	Jun. 30, 2023
Net gains and losses recognized during the period		$ (1,176)	$ (3,016)
Less: Net gains and losses recognized during the period on securities sold during the period		(266)	(13)
Unrealized gains and losses recognized during the reporting period on securities still held at the reporting date (1)	[1]	(910)	(3,003)
Net gains and losses recognized during the period		(7)	0
Less: Net gains and losses recognized during the period on securities sold during the period		0	0
Corporate debt securities, Unrealized gains (losses)		$ (7)	$ 0

[1] Includes net unrealized and realized losses as a result of the measurement alternative of $1.0 million and $2.3 million for the fiscal years ended June 30, 2024, and 2023, respectively.