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Note 5 - Fair Value Measurements - Fair Value Measurements (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Jun. 30, 2024
--- | --- | ---
Assets, Fair Value Disclosure |  | $ 143,315 | $ 159,578
US Treasury Bill Securities [Member] |  |  |
Investments, fair value | [1] | 107,202 | 91,319
US Treasury Notes Securities [Member] |  |  |
Investments, fair value | [1] | 10,041 | 34,772
Fair Value, Inputs, Level 1 [Member] |  |  |
Assets, Fair Value Disclosure |  | 26,072 | 33,487
Fair Value, Inputs, Level 1 [Member] | US Treasury Bill Securities [Member] |  |  |
Investments, fair value | [1] | 0 | 0
Fair Value, Inputs, Level 1 [Member] | US Treasury Notes Securities [Member] |  |  |
Investments, fair value | [1] | 0 | 0
Fair Value, Inputs, Level 2 [Member] |  |  |
Assets, Fair Value Disclosure |  | 117,243 | 126,091
Fair Value, Inputs, Level 2 [Member] | US Treasury Bill Securities [Member] |  |  |
Investments, fair value | [1] | 107,202 | 91,319
Fair Value, Inputs, Level 2 [Member] | US Treasury Notes Securities [Member] |  |  |
Investments, fair value | [1] | 10,041 | 34,772
Fair Value, Inputs, Level 3 [Member] |  |  |
Assets, Fair Value Disclosure |  | 0 | 0
Fair Value, Inputs, Level 3 [Member] | US Treasury Bill Securities [Member] |  |  |
Investments, fair value | [1] | 0 | 0
Fair Value, Inputs, Level 3 [Member] | US Treasury Notes Securities [Member] |  |  |
Investments, fair value | [1] | 0 | 0
Money Market Funds [Member] |  |  |
Cash and cash equivalents, fair value | [2] | 26,072 | 33,487
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Cash and cash equivalents, fair value | [2] | 26,072 | 33,487
Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Cash and cash equivalents, fair value | [2] | 0 | 0
Money Market Funds [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Cash and cash equivalents, fair value | [2] | $ 0 | $ 0
[1] | We have current and non-current debt securities (U.S. Treasury bills and notes) intended to enhance returns on our cash as well as to fund future obligations.
[2] | Our corporate money market funds are readily convertible into cash and the net asset value of each fund on the last day of the quarter is used to determine its fair value.

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