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Note 2 - Fair Value Measurements - Assets Categorized on Basis of Various Levels (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Sep. 30, 2023
--- | --- | ---
Assets, fair value | $ 60,957 | $ 59,392
Money Market Funds [Member] |  |
Assets, fair value | 60,946 | 59,382
Mutual Fund Investment [Member] |  |
Assets, fair value | 11 | 10
Cash and Cash Equivalents [Member] |  |
Assets, fair value | 60,946 | 59,382
Marketable Securities [Member] |  |
Assets, fair value | 11 | 10
Fair Value, Inputs, Level 1 [Member] |  |
Assets, fair value | 60,957 | 59,392
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member] |  |
Assets, fair value | 60,946 | 59,382
Fair Value, Inputs, Level 1 [Member] | Mutual Fund Investment [Member] |  |
Assets, fair value | 11 | 10
Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member] |  |
Assets, fair value | 60,946 | 59,382
Fair Value, Inputs, Level 1 [Member] | Marketable Securities [Member] |  |
Assets, fair value | 11 | 10
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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