Note 1 - Basis of Presentation - Carrying Amount of Assets and Liabilities associated with VIE's (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Jun. 30, 2024	Dec. 31, 2023
Investments in trading securities at fair value, current	$ 9,671	$ 9,644
Total VIE assets, maximum exposure to loss	50,108	51,963	$ 53,632
Variable Interest Entity, Not Primary Beneficiary [Member]
Investments in trading securities at fair value, current	9,671	9,644
Investments in trading securities at fair value, non-current	794	806
Other receivables	29	28
Total VIE assets, maximum exposure to loss	$ 10,494	$ 10,478