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Note 5 - Fair Value Measurements (Details Textual) - USD ($)
$ in Thousands
9 Months Ended
Mar. 31, 2025
Jun. 30, 2024
Assets, Fair Value Disclosure $ 143,315 $ 159,578
Unrealized Gain (Loss) on Investments 0  
Long-Term Debt, Fair Value 0 0
Fair Value, Inputs, Level 3 [Member]    
Assets, Fair Value Disclosure 0 0
Liabilities, Fair Value Disclosure $ 0 $ 0