Note 1 - Basis of Presentation - Carrying Amount of Assets and Liabilities associated with VIE's (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Jun. 30, 2024	Sep. 30, 2023
Investments in trading securities at fair value, current	$ 9,713	$ 9,644
Total VIE assets, maximum exposure to loss	51,084	51,963	$ 54,092
Variable Interest Entity, Not Primary Beneficiary [Member]
Investments in trading securities at fair value, current	9,713	9,644
Investments in trading securities at fair value, non-current	858	806
Other receivables	25	28
Total VIE assets, maximum exposure to loss	$ 10,596	$ 10,478