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Note 2 - Fair Value Measurements - Assets Categorized on Basis of Various Levels (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Sep. 30, 2022
--- | --- | ---
Assets, fair value | $ 59,392 | $ 54,234
Money Market Funds [Member] |  |
Assets, fair value | 59,382 | 54,225
Mutual Fund Investment [Member] |  |
Assets, fair value | 10 | 9
Cash and Cash Equivalents [Member] |  |
Assets, fair value | 59,382 | 54,225
Marketable Securities [Member] |  |
Assets, fair value | 10 | 9
Fair Value, Inputs, Level 1 [Member] |  |
Assets, fair value | 59,392 | 54,234
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member] |  |
Assets, fair value | 59,382 | 54,225
Fair Value, Inputs, Level 1 [Member] | Mutual Fund Investment [Member] |  |
Assets, fair value | 10 | 9
Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member] |  |
Assets, fair value | 59,382 | 54,225
Fair Value, Inputs, Level 1 [Member] | Marketable Securities [Member] |  |
Assets, fair value | 10 | 9
Fair Value, Inputs, Level 2 [Member] |  |
Assets, fair value | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Money Market Funds [Member] |  |
Assets, fair value | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Mutual Fund Investment [Member] |  |
Assets, fair value | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Cash and Cash Equivalents [Member] |  |
Assets, fair value | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Marketable Securities [Member] |  |
Assets, fair value | 0 | 0
Fair Value, Inputs, Level 3 [Member] |  |
Assets, fair value | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Money Market Funds [Member] |  |
Assets, fair value | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Mutual Fund Investment [Member] |  |
Assets, fair value | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Cash and Cash Equivalents [Member] |  |
Assets, fair value | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Marketable Securities [Member] |  |
Assets, fair value | $ 0 | $ 0

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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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