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Note 5 - Fair Value Measurements - Fair Value Measurements (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Sep. 30, 2022
--- | --- | ---
U.S Treasury securities | $ 132,096 |
Fair value | 28,511 |
U.S Treasury securities | 28,511 |
Certificates of Deposit [Member] |  |
Fair value | 13,111 |
U.S Treasury securities | 13,111 |
US Treasury Securities [Member] |  |
Fair value | 15,400 |
U.S Treasury securities | 15,400 |
Fair Value, Inputs, Level 1 [Member] |  |
U.S Treasury securities | 18,212 |
Fair value | 0 |
U.S Treasury securities | 0 |
Fair Value, Inputs, Level 1 [Member] | Certificates of Deposit [Member] |  |
Fair value | 0 |
U.S Treasury securities | 0 |
Fair Value, Inputs, Level 1 [Member] | US Treasury Securities [Member] |  |
Fair value | 0 |
U.S Treasury securities | 0 |
Fair Value, Inputs, Level 2 [Member] |  |
U.S Treasury securities | 113,884 |
Fair value | 28,511 |
U.S Treasury securities | 28,511 |
Fair Value, Inputs, Level 2 [Member] | Certificates of Deposit [Member] |  |
Fair value | 13,111 |
U.S Treasury securities | 13,111 |
Fair Value, Inputs, Level 2 [Member] | US Treasury Securities [Member] |  |
Fair value | 15,400 |
U.S Treasury securities | 15,400 |
Fair Value, Inputs, Level 3 [Member] |  |
U.S Treasury securities | 0 |
Fair value | 0 | $ 0
U.S Treasury securities | 0 | $ 0
Fair Value, Inputs, Level 3 [Member] | Certificates of Deposit [Member] |  |
Fair value | 0 |
U.S Treasury securities | 0 |
Fair Value, Inputs, Level 3 [Member] | US Treasury Securities [Member] |  |
Fair value | 0 |
U.S Treasury securities | 0 |
US Treasury Securities [Member] |  |
U.S Treasury securities | 113,884 |
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
U.S Treasury securities | 0 |
US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
U.S Treasury securities | 113,884 |
US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
U.S Treasury securities | 0 |
Money Market Funds [Member] |  |
U.S Treasury securities | 18,212 |
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |
U.S Treasury securities | 18,212 |
Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member] |  |
U.S Treasury securities | $ 0 |

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