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Note 2 - Fair Value Measurement - Financial Assets and Liabilities on Recurring Basis (Details) - Fair Value, Recurring [Member] - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Assets | $ 70,152 | $ 90,403
Liabilities | 8,238 | 9,932
Contingent Consideration Liabilities [Member] |  |
Liabilities | 8,238 |
Warrant Liabilities [Member] |  |
Liabilities |  | 2,780
Money Market Funds [Member] |  |
Assets | 70,152 | 90,403
Contingent Consideration Liabilities [Member] |  |
Liabilities |  | 7,152
Fair Value, Inputs, Level 1 [Member] |  |
Assets | 70,152 | 90,403
Liabilities | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Contingent Consideration Liabilities [Member] |  |
Liabilities | 0 |
Fair Value, Inputs, Level 1 [Member] | Warrant Liabilities [Member] |  |
Liabilities |  | 0
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member] |  |
Assets | 70,152 | 90,403
Fair Value, Inputs, Level 1 [Member] | Contingent Consideration Liabilities [Member] |  |
Liabilities |  | 0
Fair Value, Inputs, Level 2 [Member] |  |
Assets | 0 | 0
Liabilities | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Contingent Consideration Liabilities [Member] |  |
Liabilities | 0 |
Fair Value, Inputs, Level 2 [Member] | Warrant Liabilities [Member] |  |
Liabilities |  | 0
Fair Value, Inputs, Level 2 [Member] | Money Market Funds [Member] |  |
Assets | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Contingent Consideration Liabilities [Member] |  |
Liabilities |  | 0
Fair Value, Inputs, Level 3 [Member] |  |
Assets | 0 | 0
Liabilities | 8,238 | 9,932
Fair Value, Inputs, Level 3 [Member] | Contingent Consideration Liabilities [Member] |  |
Liabilities | 8,238 |
Fair Value, Inputs, Level 3 [Member] | Warrant Liabilities [Member] |  |
Liabilities |  | 2,780
Fair Value, Inputs, Level 3 [Member] | Money Market Funds [Member] |  |
Assets | $ 0 | 0
Fair Value, Inputs, Level 3 [Member] | Contingent Consideration Liabilities [Member] |  |
Liabilities |  | $ 7,152

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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 http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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