Note 2 - Basis of Presentation - Carrying Amount of Assets and Liabilities associated with VIE's (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Jun. 30, 2023	Dec. 31, 2022
Investments in securities at fair value, current	$ 10,092	$ 11,642
Total VIE assets, maximum exposure to loss	53,632	55,673	$ 54,951
Variable Interest Entity, Not Primary Beneficiary [Member]
Investments in securities at fair value, current	10,092	11,642
Investments in equity securities at fair value, non-current	760	785
Other receivables	34	45
Total VIE assets, maximum exposure to loss	$ 10,886	$ 12,472