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Note 5 - Fair Value Measurements - Fair Value Measurements (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Jun. 30, 2023
--- | --- | ---
Total |  | $ 129,106 | $ 134,500
US Treasury Bill Securities [Member] |  |  |
Investments (2) | [1] | 97,679 | 110,577
US Treasury Notes Securities [Member] |  |  |
Investments (2) | [1] | 15,064 |
Money Market Funds [Member] |  |  |
Corporate money market funds (1) | [2] | 16,363 | 23,923
Fair Value, Inputs, Level 1 [Member] |  |  |
Total |  | 16,363 | 23,923
Fair Value, Inputs, Level 1 [Member] | US Treasury Bill Securities [Member] |  |  |
Investments (2) |  | 0 | 0
Fair Value, Inputs, Level 1 [Member] | US Treasury Notes Securities [Member] |  |  |
Investments (2) |  | 0 |
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member] |  |  |
Corporate money market funds (1) |  | 16,363 | 23,923
Fair Value, Inputs, Level 2 [Member] |  |  |
Total |  | 112,743 | 110,577
Fair Value, Inputs, Level 2 [Member] | US Treasury Bill Securities [Member] |  |  |
Investments (2) |  | 97,679 | 110,577
Fair Value, Inputs, Level 2 [Member] | US Treasury Notes Securities [Member] |  |  |
Investments (2) |  | 15,064 |
Fair Value, Inputs, Level 2 [Member] | Money Market Funds [Member] |  |  |
Corporate money market funds (1) |  | 0 | 0
Fair Value, Inputs, Level 3 [Member] |  |  |
Total |  | 0 | 0
Fair Value, Inputs, Level 3 [Member] | US Treasury Bill Securities [Member] |  |  |
Investments (2) |  | 0 | 0
Fair Value, Inputs, Level 3 [Member] | US Treasury Notes Securities [Member] |  |  |
Investments (2) |  | 0 |
Fair Value, Inputs, Level 3 [Member] | Money Market Funds [Member] |  |  |
Corporate money market funds (1) |  | $ 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. All unrealized gains and losses were included in Accumulated other comprehensive loss within the consolidated balance sheets. There were no material gross unrealized gains or losses on the investments at December 31, 2023 or June 30, 2023.
[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 probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -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 No definition available. + Details
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- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: 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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