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Fair Value Measurements - Fair Value by Major Security Type (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Sep. 30, 2024
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Gross Unrealized Loss | $ (1) |
Short-term Securities | 1,409 | $ 7,945
Long-term Securities | 130 | 249
Fair Value, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cost Basis | 2,675 | 8,639
Gross Unrealized Gain | 0 | 8
Gross Unrealized Loss | (1) | 0
Fair Value | 2,774 | 8,647
Cash Equivalents | 1,235 | 453
Short-term Securities | 1,409 | 7,945
Long-term Securities | 130 | 249
Fair Value, Recurring [Member] | Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cost Basis | 1,235 | 301
Gross Unrealized Gain | 0 | 0
Gross Unrealized Loss | 0 | 0
Fair Value | 1,235 | 301
Cash Equivalents | 1,235 | 301
Short-term Securities | 0 | 0
Long-term Securities | 0 | 0
Fair Value, Recurring [Member] | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cost Basis | 1,440 | 8,338
Gross Unrealized Gain | 0 | 8
Gross Unrealized Loss | (1) | 0
Fair Value | 1,539 | 8,346
Cash Equivalents | 0 | 152
Short-term Securities | 1,409 | 7,945
Long-term Securities | 130 | 249
Fair Value, Recurring [Member] | Level 2 [Member] | Certificates of Deposit [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cost Basis | 255 | 401
Gross Unrealized Gain | 0 | 0
Gross Unrealized Loss | 0 | 0
Fair Value | 255 | 401
Cash Equivalents | 0 | 152
Short-term Securities | 255 | 0
Long-term Securities | 0 | 249
Fair Value, Recurring [Member] | Level 2 [Member] | U.S. Government Agency Bonds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cost Basis | 195 | 2,591
Gross Unrealized Gain | 0 | 3
Gross Unrealized Loss | 0 | 0
Fair Value | 295 | 2,594
Cash Equivalents | 0 | 0
Short-term Securities | 295 | 2,594
Long-term Securities | 0 | 0
Fair Value, Recurring [Member] | Level 2 [Member] | Municipal Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cost Basis | 990 | 2,127
Gross Unrealized Gain | 0 | 2
Gross Unrealized Loss | (1) | 0
Fair Value | 989 | 2,129
Cash Equivalents | 0 | 0
Short-term Securities | 859 | 2,129
Long-term Securities | $ 130 | 0
Fair Value, Recurring [Member] | Level 2 [Member] | Corporate Bonds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cost Basis |  | 3,219
Gross Unrealized Gain |  | 3
Gross Unrealized Loss |  | 0
Fair Value |  | 3,222
Cash Equivalents |  | 0
Short-term Securities |  | 3,222
Long-term Securities |  | $ 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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