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Note 6 - Fair Value Measurements - Fair Value by Major Security Type (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Sep. 30, 2023
--- | --- | ---
Cash Equivalents | $ 1,437 |
Short-term marketable securities | 3,011 | $ 1,481
Fair Value, Nonrecurring [Member] |  |
Cost Basis | 4,451 | 3,798
Gross Unrealized Gain | 0 | 0
Gross Unrealized Loss | (3) | (10)
Fair Value | 4,448 | 3,788
Cash Equivalents | 1,437 | 2,307
Short-term marketable securities | 3,011 | 1,481
Long-term Securities | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member] |  |
Cost Basis | 1,437 | 2,307
Gross Unrealized Gain | 0 | 0
Gross Unrealized Loss | 0 | 0
Fair Value | 1,437 | 2,307
Cash Equivalents |  | 2,307
Short-term marketable securities |  | 0
Long-term Securities |  | 0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member] |  |
Cost Basis | 3,014 | 1,491
Gross Unrealized Gain | 0 | 0
Gross Unrealized Loss | (3) | (10)
Fair Value | 3,011 | 1,481
Cash Equivalents | 0 | 0
Short-term marketable securities | 3,011 | 1,481
Long-term Securities | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member] | Certificates of Deposit [Member] |  |
Cost Basis | 552 | 301
Gross Unrealized Gain | 0 | 0
Gross Unrealized Loss | 0 | 0
Fair Value | 552 | 301
Cash Equivalents | 0 | 0
Short-term marketable securities | 552 | 301
Long-term Securities | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member] | US States and Political Subdivisions Debt Securities [Member] |  |
Cost Basis | 1,105 | 926
Gross Unrealized Gain | 0 | 0
Gross Unrealized Loss | (1) | (7)
Fair Value | 1,104 | 919
Cash Equivalents | 0 | 0
Short-term marketable securities | 1,104 | 919
Long-term Securities | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member] | Corporate Debt Securities [Member] |  |
Cost Basis | 1,357 | 264
Gross Unrealized Gain | 0 | 0
Gross Unrealized Loss | (2) | (3)
Fair Value | 1,355 | 261
Cash Equivalents | 0 | 0
Short-term marketable securities | 1,355 | 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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