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Note 2 - Fair Value Measurement (Tables) | 12 Months Ended
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Dec. 31, 2020
Notes Tables |
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] |
As of December 31, 2020 |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market accounts |  | $ | 90,403 |  |  | $ | - |  |  | $ | - |  |  | $ | 90,403 |
Total |  |  | 90,403 |  |  |  | - |  |  |  | - |  |  |  | 90,403 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration - business combinations |  |  | - |  |  |  | - |  |  |  | 7,152 |  |  |  | 7,152 |
Warrant liability |  |  | - |  |  |  | - |  |  |  | 2,780 |  |  |  | 2,780 |
Total |  | $ | - |  |  | $ | - |  |  | $ | 9,932 |  |  | $ | 9,932 |
As of December 31, 2019 |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market accounts |  | $ | 6,448 |  |  | $ | - |  |  | $ | - |  |  | $ | 6,448 |
Convertible debt held at fair value |  |  | - |  |  |  | - |  |  |  | 1,000 |  |  |  | 1,000 |
Total |  |  | 6,448 |  |  |  | - |  |  |  | 1,000 |  |  |  | 7,448 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration - business combinations |  |  | - |  |  |  | - |  |  |  | 1,914 |  |  |  | 1,914 |
Warrant liability |  |  | - |  |  |  | - |  |  |  | 39,602 |  |  |  | 39,602 |
Total |  | $ | - |  |  | $ | - |  |  | $ | 41,516 |  |  | $ | 41,516 |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] |
(In thousands) |  | 2020 |  |  | 2019 |
Beginning balance |  | $ | 1,000 |  |  | $ | - |
Purchases |  |  | - |  |  |  | 1,000 |
Change in fair value recognized in net income |  |  | 1,319 |  |  |  | - |
Recognition of accrued interest in fair value upon conversion |  |  | 58 |  |  |  | - |
Conversion of convertible debt to preferred stock |  |  | (2,377 | ) |  |  | - |
Total |  | $ | - |  |  | $ | 1,000 |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] |
(In thousands) |  | 2020 |  |  | 2019 |
Beginning balance |  | $ | 1,914 |  |  | $ | - |
Additions |  |  | 3,663 |  |  |  | 2,347 |
Change in fair value recognized in net income |  |  | 1,575 |  |  |  | 50 |
Payments earned, reclassified to accrued liabilities |  |  | - |  |  |  | (483 | )
Total |  | $ | 7,152 |  |  | $ | 1,914 |
Warrant Liabilities [Member] |
Notes Tables |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] |
(In thousands) |  | 2020 |  |  | 2019 |
Beginning balance |  | $ | 39,602 |  |  | $ | 28,516 |
Exercised warrants |  |  | (33,221 | ) |  |  | (1,749 | )
Change in fair value recognized in net income |  |  | (3,601 | ) |  |  | 12,835 |
Total |  | $ | 2,780 |  |  | $ | 39,602 |

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- Definition Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19279-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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