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Note 5 - Fair Value Measurements - Fair Value Measurements (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Jun. 30, 2022
--- | --- | ---
Corporate money market funds (1) | [1] | $ 23,923 |
Investments (2) | [2] | 110,577 |
Total |  | 134,500 |
Fair Value, Inputs, Level 1 [Member] |  |  |
Investments (2) | [2] | 0 |
Total |  | 23,923 |
Fair Value, Inputs, Level 2 [Member] |  |  |
Investments (2) | [2] | 110,577 |
Total |  | 110,577 |
Fair Value, Inputs, Level 3 [Member] |  |  |
Investments (2) | [2] | 0 |
Total |  | 0 |
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Corporate money market funds (1) | [1] | 23,923 | $ 51,035
Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Corporate money market funds (1) | [1] | 0 |
Money Market Funds [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Corporate money market funds (1) | [1] | $ 0 |
[1] | We invest excess cash in corporate money market funds and short-term investments. 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. Our corporate money market funds are classified as Level 1 assets and are included in Cash and cash equivalents within the consolidated balance sheets.
[2] | Our investments as of June 30, 2023 consisted solely of United States Treasury Bills with maturities of less than one year. Previously held investments included fixed income securities including municipal bonds, commercial paper and certificates of deposits with maturities of less than one year. We classify our investments as available-for-sale debt investments. The fair value of our underlying investments is based on observable inputs. Our investments are classified as Level 2 and are included in Investments (short-term) within the consolidated balance sheets. All unrealized gains and losses were included, net of tax, in Accumulated other comprehensive loss within the consolidated balance sheets. There were no material gross unrealized gains or losses on the investments as of June 30, 2023 or 2022.

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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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