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Note 5 - Fair Value Measurements - Fair Value Measurements (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Jun. 30, 2021
--- | --- | ---
Corporate money market funds(1) | [1] | $ 32,152 | $ 70,247
Investments(2) | [2] | 9,525 | 0
Total |  | 41,677 | 70,247
Fair Value, Inputs, Level 1 [Member] |  |  |
Investments(2) | [2] | 0 | 0
Total |  | 32,152 | 70,247
Fair Value, Inputs, Level 2 [Member] |  |  |
Investments(2) | [2] | 9,525 | 0
Total |  | 9,525 | 0
Fair Value, Inputs, Level 3 [Member] |  |  |
Investments(2) | [2] | 0 | 0
Total |  | 0 | 0
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Corporate money market funds(1) | [1] | 32,152 | 70,247
Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Corporate money market funds(1) | [1] | 0 | 0
Money Market Funds [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Corporate money market funds(1) | [1] | $ 0 | $ 0
[1] | 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 consist of municipal bonds, commercial paper and certificates of deposit with maturities of one year or less. 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 in Accumulated Other Comprehensive Income (Loss) within the Consolidated Balance Sheets. There were no material gross unrealized gains or losses on the investments at March 31, 2022. We did not hold any investments as of June 30, 2021.

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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