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Note 4 - Fair Value Measurement and Fair Value of Financial Instruments - Assets and Liabilities Measured at Fair Values on a Recurring Basis (Details) - Fair Value, Recurring [Member] - USD ($) $ in Thousands | Dec. 31, 2022 | Sep. 30, 2022
--- | --- | ---
Warrant liabilities: |  |
Warrant liability, total | $ 452 | $ 749
Contingent consideration obligations |  | 250
Total liabilities |  | 999
Montage Warrant [Member] |  |
Warrant liabilities: |  |
Warrant liability | 12 | 12
Series Warrants [Member] |  |
Warrant liabilities: |  |
Warrant liability | 113 | 234
Series D Warrants [Member] |  |
Warrant liabilities: |  |
Warrant liability | 327 | 503
Fair Value, Inputs, Level 1 [Member] |  |
Warrant liabilities: |  |
Warrant liability, total |  |
Contingent consideration obligations |  | 0
Total liabilities |  | 0
Fair Value, Inputs, Level 1 [Member] | Montage Warrant [Member] |  |
Warrant liabilities: |  |
Warrant liability | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Series Warrants [Member] |  |
Warrant liabilities: |  |
Warrant liability | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Series D Warrants [Member] |  |
Warrant liabilities: |  |
Warrant liability | 0 | 0
Fair Value, Inputs, Level 2 [Member] |  |
Warrant liabilities: |  |
Warrant liability, total |  |
Contingent consideration obligations |  | 0
Total liabilities |  | 0
Fair Value, Inputs, Level 2 [Member] | Montage Warrant [Member] |  |
Warrant liabilities: |  |
Warrant liability | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Series Warrants [Member] |  |
Warrant liabilities: |  |
Warrant liability | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Series D Warrants [Member] |  |
Warrant liabilities: |  |
Warrant liability | 0 | 0
Fair Value, Inputs, Level 3 [Member] |  |
Warrant liabilities: |  |
Warrant liability, total | 452 | 749
Contingent consideration obligations |  | 250
Total liabilities |  | 999
Fair Value, Inputs, Level 3 [Member] | Montage Warrant [Member] |  |
Warrant liabilities: |  |
Warrant liability | 12 | 12
Fair Value, Inputs, Level 3 [Member] | Series Warrants [Member] |  |
Warrant liabilities: |  |
Warrant liability | 113 | 234
Fair Value, Inputs, Level 3 [Member] | Series D Warrants [Member] |  |
Warrant liabilities: |  |
Warrant liability | $ 327 | $ 503

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- Definition Sum of values of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price. + References No definition available. + Details
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- Definition Amount of liability recognized arising from contingent consideration in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=126975305&loc=d3e6927-128479 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 35 -Paragraph 1 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126966325&loc=d3e6819-128478 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -URI https://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476 + Details
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- Definition Fair value of financial and nonfinancial obligations. + 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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