Note 2 - Basis of Presentation - Carrying Amount of Assets and Liabilities associated with VIE's (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Jun. 30, 2023	Sep. 30, 2022
Investments in securities at fair value, current	$ 10,793	$ 11,642
Investments in equity securities at fair value, non-current	1,127	1,563
Total VIE assets, maximum exposure to loss	54,092	55,673	$ 56,985
Variable Interest Entity, Not Primary Beneficiary [Member]
Investments in securities at fair value, current	10,793	11,642
Investments in equity securities at fair value, non-current	702	785
Other receivables	44	45
Total VIE assets, maximum exposure to loss	$ 11,539	$ 12,472