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Note 4 - Fair Value Measurements - Fair Value Measurements (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Sep. 30, 2022
--- | --- | ---
cash equivalents | $ 26,467 | $ 15
Investment securities: | 136,629 | 28,549
Fair Value, Inputs, Level 1 [Member] |  |
cash equivalents | 26,467 | 15
Investment securities: | 0 | 0
Fair Value, Inputs, Level 2 [Member] |  |
cash equivalents | 0 | 0
Investment securities: | 136,629 | 28,549
Fair Value, Inputs, Level 3 [Member] |  |
cash equivalents | 0 | 0
Investment securities: | 0 | 0
Money Market Funds [Member] |  |
cash equivalents | 26,467 | 15
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |
cash equivalents | 26,467 | 15
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: | 8,115 | 13,456
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: | 8,115 | 13,456
Certificates of Deposit [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Investment securities: | 0 | 0
US Treasury Securities [Member] |  |
Investment securities: | 128,514 | 15,093
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: | 128,514 | 15,093
US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Investment securities: | $ 0 | $ 0

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