Note 2 - Investments - Fair Value and Effect of Embedded Derivatives (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022	Jun. 30, 2022
Statement [Line Items]
Equity price risk exposure, asset	$ 85		$ 85		$ 3
Equity price risk exposure	55	$ 1,491	82	$ 2,050
Equity price risk exposure	$ (55)	$ (1,491)	$ (82)	$ (2,050)