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Note 4 - Fair Value of Financial Instruments - Fair Value by Hierarchy (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Sep. 30, 2022
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Business Combination, Contingent Consideration, Liability, Current | $ 0 | $ 175
Fair Value, Recurring [Member] |  |
Total assets |  | 894
Business Combination, Contingent Consideration, Liability, Current |  | 175
Total liabilities |  | 175
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Total assets |  | 0
Business Combination, Contingent Consideration, Liability, Current |  | 0
Total liabilities |  | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Total assets |  | 894
Business Combination, Contingent Consideration, Liability, Current |  | 0
Total liabilities |  | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Total assets |  | 0
Business Combination, Contingent Consideration, Liability, Current |  | 175
Total liabilities |  | 175
Corporate Debt Securities [Member] | Fair Value, Recurring [Member] |  |
Corporate bonds |  | 894
Corporate Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Corporate bonds |  | 0
Corporate Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Corporate bonds |  | 894
Corporate Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Corporate bonds |  | $ 0

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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 -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of liability recognized arising from contingent consideration in a business combination, expected to be settled within one year or the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479668/805-30-25-6 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 35 -Paragraph 1 -Subparagraph b -SubTopic 30 -Topic 805 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479613/805-30-35-1 + Details
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- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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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- Definition Fair value of financial and nonfinancial obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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