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Note 8 - Fair Value Measurements - Minimum Assessment Agreements (Details) - Fair Value, Inputs, Level 3 [Member] - Fair Value, Nonrecurring [Member] - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
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Obligation under assessment arrangements | $ 25,289 | $ 26,246
Reported Value Measurement [Member] |  |
Obligation under assessment arrangements | 25,590 | 22,062
Estimate of Fair Value Measurement [Member] |  |
Obligation under assessment arrangements | $ 27,042 | $ 26,542

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- Definition Fair value portion of arrangements with third parties, including, but not limited to, operating lease arrangement and arrangement in which the entity has agreed to expend funds to procure goods or services, or has agreed to commit resources to supply goods or services. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(25)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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