Note 3 - Investments - Unrealized Gains and Losses (Details) - USD ($) $ in Thousands		3 Months Ended
		Sep. 30, 2023	Sep. 30, 2022
Net gains and losses recognized during the period on equity securities		$ (1,261)	$ (1,930)
Less: Net gains and losses recognized during the period on equity securities sold during the period		(43)	0
Unrealized gains and losses recognized during the reporting period on equity securities still held at the reporting date (1)	[1]	$ (1,218)	$ (1,930)

[1] Includes $1.8 million of net losses for the nine months ended March 31, 2023, as a result of the measurement alternative. There were no net gains (losses) as a result of the measurement alternative for the three months ended March 31, 2023, or for the three and nine months ended March 31, 2022.