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Note 5 - Fair Value Measurements (Tables) | 9 Months Ended
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Mar. 31, 2025
Notes Tables |
Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] |
|  |  | Fair Value Measurements at March 31, 2025 |
Financial Assets | Balance Sheet Location |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Corporate money market funds (1) | Cash and cash equivalents |  | $ | 26,072 |  |  | $ | - |  |  | $ | - |  |  | $ | 26,072 |
U.S. Treasury bills (2) | Investments, short-term |  |  | - |  |  |  | 107,202 |  |  |  | - |  |  |  | 107,202 |
U.S. Treasury notes (2) | Investments, long-term |  |  | - |  |  |  | 10,041 |  |  |  | - |  |  |  | 10,041 |
Total |  | $ | 26,072 |  |  | $ | 117,243 |  |  | $ | - |  |  | $ | 143,315 |
|  |  | Fair Value Measurements at June 30, 2024 |
Financial Assets | Balance Sheet Location |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Corporate money market funds (1) | Cash and cash equivalents |  | $ | 33,487 |  |  | $ | - |  |  | $ | - |  |  | $ | 33,487 |
U.S. Treasury bills (2) | Investments, short-term |  |  | - |  |  |  | 91,319 |  |  |  | - |  |  |  | 91,319 |
U.S. Treasury notes (2) | Investments, long-term |  |  | - |  |  |  | 34,772 |  |  |  | - |  |  |  | 34,772 |
Total |  | $ | 33,487 |  |  | $ | 126,091 |  |  | $ | - |  |  | $ | 159,578 |

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