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Note 9 - Accrued Expenses (Tables) | 12 Months Ended
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Dec. 31, 2019
Notes Tables |
Schedule of Accrued Liabilities [Table Text Block] |
|  | December 31,
|  | 2019 |  | 2018
Compensation and related expenses |  | $ | 5,830 |  |  | $ | 4,446 |
Professional fees |  |  | 3,850 |  |  |  | 1,989 |
Lease liability - current |  |  | 1,141 |  |  |  | – |
Income taxes payable |  |  | – |  |  |  | 385 |
Research grants |  |  | 393 |  |  |  | 400 |
Clinical trial costs |  |  | 788 |  |  |  | 577 |
Other |  |  | 443 |  |  |  | 349 |
Total |  | $ | 12,445 |  |  | $ | 8,146 |

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