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Note 5 - Fair Value Measurements - Fair Value Measurements (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Jun. 30, 2024
--- | --- | ---
Total |  | $ 0 | $ 0
US Treasury Bill Securities [Member] |  |  |
Investments, fair value | [1] | 0 | 0
US Treasury Notes Securities [Member] |  |  |
Investments, fair value | [1] | 0 | 0
Money Market Funds [Member] |  |  |
Cash and cash equivalents, fair value | [2] | 0 | 0
Fair Value, Inputs, Level 2 [Member] |  |  |
Total |  | 13,830 | 33,487
Fair Value, Inputs, Level 2 [Member] | US Treasury Bill Securities [Member] |  |  |
Investments, fair value | [1] | 0 | 0
Fair Value, Inputs, Level 2 [Member] | US Treasury Notes Securities [Member] |  |  |
Investments, fair value | [1] | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Money Market Funds [Member] |  |  |
Cash and cash equivalents, fair value | [2] | 13,830 | 33,487
Fair Value, Inputs, Level 3 [Member] |  |  |
Total |  | 127,141 | 126,091
Fair Value, Inputs, Level 3 [Member] | US Treasury Bill Securities [Member] |  |  |
Investments, fair value | [1] | 82,049 | 91,319
Fair Value, Inputs, Level 3 [Member] | US Treasury Notes Securities [Member] |  |  |
Investments, fair value | [1] | 45,092 | 34,772
Fair Value, Inputs, Level 3 [Member] | Money Market Funds [Member] |  |  |
Cash and cash equivalents, fair value | [2] | 0 | 0
Fair Value, Inputs, Level 1 [Member] |  |  |
Total |  | 140,971 | 159,578
Fair Value, Inputs, Level 1 [Member] | US Treasury Bill Securities [Member] |  |  |
Investments, fair value | [1] | 82,049 | 91,319
Fair Value, Inputs, Level 1 [Member] | US Treasury Notes Securities [Member] |  |  |
Investments, fair value | [1] | 45,092 | 34,772
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member] |  |  |
Cash and cash equivalents, fair value | [2] | $ 13,830 | $ 33,487
[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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- Definition Fair value portion of asset recognized for present right to economic benefit. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 100 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-100 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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