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Fair Value Measurements - Fair Value by Major Security Type (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Sep. 30, 2023
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term securities | $ 7,945 | $ 1,481
Long-term Securities | 249 |
Fair Value, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cost basis | 8,639 | 3,798
Unrealized Gain | 8 | 0
Unrealized loss | 0 | (10)
Fair value | 8,647 | 3,788
Cash equivalents | 453 | 2,307
Short-term securities | 7,945 | 1,481
Long-term Securities | 249 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cost basis | 301 | 2,307
Unrealized Gain | 0 | 0
Unrealized loss | 0 | 0
Fair value | 301 | 2,307
Cash equivalents | 301 | 2,307
Short-term securities | 0 | 0
Long-term Securities | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cost basis | 8,338 | 1,491
Unrealized Gain | 8 | 0
Unrealized loss | 0 | (10)
Fair value | 8,346 | 1,481
Cash equivalents | 152 | 0
Short-term securities | 7,945 | 1,481
Long-term Securities | 249 | 0
Certificates of Deposit [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cost basis | 401 | 301
Unrealized Gain | 0 | 0
Unrealized loss | 0 | 0
Fair value | 401 | 301
Cash equivalents | 152 | 0
Short-term securities | 0 | 301
Long-term Securities | 249 | 0
U.S. Government Agency Bonds [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cost basis | 2,591 |
Unrealized Gain | 3 |
Unrealized loss | 0 |
Fair value | 2,594 |
Short-term securities | 2,594 |
Long-term Securities | 0 |
Municipal Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cost basis | 2,127 | 926
Unrealized Gain | 2 | 0
Unrealized loss | 0 | (7)
Fair value | 2,129 | 919
Cash equivalents | 0 | 0
Short-term securities | 2,129 | 919
Long-term Securities | 0 | 0
Corporate Bonds [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cost basis | 3,219 | 264
Unrealized Gain | 3 | 0
Unrealized loss | 0 | (3)
Fair value | 3,222 | 261
Cash equivalents | 0 | 0
Short-term securities | 3,222 | 261
Long-term Securities | $ 0 | $ 0

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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