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Note 5 - Fair Value Measurements - Fair Value by Major Security Type (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Sep. 30, 2021
--- | --- | ---
Short-term marketable securities | $ 6,397 | $ 5,686
Certificates of deposit | 781 | 1,875
Fair Value, Nonrecurring [Member] |  |
Cost basis | 8,584 | 8,493
Unrealized loss | (90) | 0
Money market funds | 90 | 0
Fair value | 8,494 | 8,493
Cash equivalents | 1,316 | 932
Short-term marketable securities | 6,397 | 5,686
Certificates of deposit | 781 | 1,875
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Cost basis | 1,316 | 932
Unrealized loss | 0 | 0
Money market funds | (0) | 0
Fair value | 1,316 | 932
Cash equivalents | 1,316 | 932
Short-term marketable securities |  | 0
Certificates of deposit |  | 0
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Cost basis | 7,268 | 7,561
Unrealized loss | (90) | 0
Money market funds | 90 | 0
Fair value | 7,178 | 7,561
Cash equivalents | 0 | 0
Short-term marketable securities | 6,397 | 5,686
Certificates of deposit | 781 | 1,875
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] | Certificates of Deposit [Member] |  |
Cost basis | 800 | 1,494
Unrealized loss | 0 | 0
Money market funds | (0) | 0
Fair value | 800 | 1,494
Cash equivalents | 0 | 0
Short-term marketable securities | 498 | 694
Certificates of deposit | 302 | 800
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] | US States and Political Subdivisions Debt Securities [Member] |  |
Cost basis | 4,066 | 5,139
Unrealized loss | (65) | 1
Money market funds | 65 | (1)
Fair value | 4,001 | 5,138
Cash equivalents | 0 | 0
Short-term marketable securities | 3,772 | 4,205
Certificates of deposit | 229 | 933
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member] |  |
Cost basis |  | 928
Unrealized loss |  | (1)
Money market funds |  | 1
Fair value |  | 929
Cash equivalents |  | 0
Short-term marketable securities |  | 787
Certificates of deposit |  | $ 142
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] | Corporate Segment [Member] |  |
Cost basis | 2,402 |
Unrealized loss | (25) |
Money market funds | 25 |
Fair value | 2,377 |
Cash equivalents | 0 |
Short-term marketable securities | 2,127 |
Certificates of deposit | $ 250 |

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 + Details
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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 No definition available. + Details
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- Definition Amount, before tax, of unrealized gain (loss) in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References No definition available. + Details
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