Note 3 - Investments - Unrealized Gains and Losses (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Net gains and losses recognized during the period		$ (231)	$ 270	$ (1,135)	$ (2,599)
Less: Net gains and losses recognized during the period on securities sold during the period		(3)	(13)	(256)	(13)
Unrealized gains and losses recognized during the reporting period on securities still held at the reporting date (1)	[1]	(228)	283	(879)	(2,586)
Net gains and losses recognized during the period		(65)	0	(20)	0
Less: Net gains and losses recognized during the period on securities sold during the period		0	0	0	0
Corporate debt securities		$ (65)	$ 0	$ (20)	$ 0

[1] Includes net unrealized and realized losses as a result of the measurement alternative of $240,000 and $1.0 million for the three and nine months ended March 31, 2024, respectively, and $0 and $1.8 million, for the three and nine months ended March 31, 2023, respectively.