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Note 5 - Fair Value Measurements (Tables) | 9 Months Ended
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Mar. 31, 2024
Notes Tables |
Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] |
|  |  | Fair Value Measurements at March 31, 2024 |
Financial Assets | Balance Sheet Location |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Corporate money market funds (1) | Cash and cash equivalents |  | $ | 27,285 |  |  | $ | - |  |  | $ | - |  |  | $ | 27,285 |
U.S. Treasury bills (2) | Investments |  |  | - |  |  |  | 82,356 |  |  |  | - |  |  |  | 82,356 |
U.S. Treasury notes (2) | Other assets |  |  | - |  |  |  | 34,867 |  |  |  | - |  |  |  | 34,867 |
Total |  | $ | 27,285 |  |  | $ | 117,223 |  |  | $ | - |  |  | $ | 144,508 |
|  |  | Fair Value Measurements at June 30, 2023 |
Financial Assets | Balance Sheet Location |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Corporate money market funds (1) | Cash and cash equivalents |  | $ | 23,923 |  |  | $ | - |  |  | $ | - |  |  | $ | 23,923 |
U.S. Treasury bills (2) | Investments |  |  | - |  |  |  | 110,577 |  |  |  | - |  |  |  | 110,577 |
Total |  | $ | 23,923 |  |  | $ | 110,577 |  |  | $ | - |  |  | $ | 134,500 |
Debt Securities, Available-for-Sale [Table Text Block] |
|  | March 31, 2024 |
|  | Amortized cost |  |  | Gross unrealized gains |  |  | Gross unrealized losses |  |  | Fair Value |
Due within one year |  | $ | 79,998 |  |  | $ | 2,358 |  |  | $ | - |  |  | $ | 82,356 |
Due within one and two years |  |  | 34,907 |  |  |  | - |  |  |  | (40 | ) |  |  | 34,867 |
Total |  | $ | 114,905 |  |  | $ | 2,358 |  |  | $ | (40 | ) |  | $ | 117,223 |

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