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Note 11 - Accrued Expenses (Tables) | 12 Months Ended
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Dec. 31, 2018
Notes Tables |
Schedule of Accrued Liabilities [Table Text Block] |
|  | December 31,
|  | 2018 |  | 2017
Compensation and related expenses |  | $ | 4,446 |  |  | $ | 2,893 |
Professional fees |  |  | 1,989 |  |  |  | 448 |
Voluntary recall |  |  | 116 |  |  |  | - |
Research grants |  |  | 400 |  |  |  | 419 |
Clinical trial costs |  |  | 577 |  |  |  | 2,318 |
Income taxes payable |  |  | 385 |  |  |  | - |
Other |  |  | 233 |  |  |  | 248 |
Total |  | $ | 8,146 |  |  | $ | 6,326 |

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