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Note 6 - Fair Value Measurements - Assets and Liabilities Carried at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022
--- | --- | --- | --- | --- | --- | --- | --- | ---
Fair value (millions) | $ 1,200 | $ 3,500 | $ 2,600 | $ 1,300 | $ 900 | $ 1,100 | $ 1,400 | $ 1,200
Fair Value, Recurring [Member] | Reported Value Measurement [Member] |  |  |  |  |  |  |  |
Cash equivalents | 9,936 |  |  | 7,913 |  |  |  |
Fair value (millions) | 1,230 |  |  | 1,270 |  |  |  |
Fair Value, Recurring [Member] | Reported Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |  |  |
Cash equivalents | 9,936 |  |  | 7,913 |  |  |  |
Fair value (millions) | 0 |  |  | 0 |  |  |  |
Fair Value, Recurring [Member] | Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |  |  |
Cash equivalents | 0 |  |  | 0 |  |  |  |
Fair value (millions) | 0 |  |  | 0 |  |  |  |
Fair Value, Recurring [Member] | Reported Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |  |
Cash equivalents | 0 |  |  | 0 |  |  |  |
Fair value (millions) | $ 1,230 |  |  | $ 1,270 |  |  |  |

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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 -Topic 805 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479581/805-30-50-1 Reference 2: 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 3: 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 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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