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Note 5 - Fair Value Measurements - Fair Value Measurements (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Sep. 30, 2024
--- | --- | ---
Cash equivalents | $ 25,142 | $ 10,378
Investment securities: | 124,498 | 139,330
Fair Value, Inputs, Level 1 [Member] |  |
Cash equivalents | 25,142 | 10,378
Investment securities: | 0 | 0
Fair Value, Inputs, Level 2 [Member] |  |
Cash equivalents | 0 | 0
Investment securities: | 124,498 | 139,330
Fair Value, Inputs, Level 3 [Member] |  |
Cash equivalents | 0 | 0
Investment securities: | 0 | 0
Money Market Funds [Member] |  |
Cash equivalents | 25,142 | 10,378
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Cash equivalents | 25,142 | 10,378
Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Cash equivalents | 0 | 0
Money Market Funds [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Cash equivalents | 0 | 0
Certificates of Deposit [Member] |  |
Investment securities: | 239 | 738
Certificates of Deposit [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Investment securities: | 0 | 0
Certificates of Deposit [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Investment securities: | 239 | 738
Certificates of Deposit [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Investment securities: | 0 | 0
US Treasury Securities [Member] |  |
Investment securities: | 124,259 | 138,592
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Investment securities: | 0 | 0
US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Investment securities: | 124,259 | 138,592
US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Investment securities: | $ 0 | $ 0

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