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Note 5 - Fair Value Measurements (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Unrealized Gain (Loss) on Investments $ 0  
Investments, Total 11,199 $ 0
Asset Impairment Charges, Total 600  
Long-Term Debt, Fair Value $ 0