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Note 10 - Accrued Expenses (Tables) | 12 Months Ended
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Dec. 31, 2016
Notes Tables |
Schedule of Accrued Liabilities [Table Text Block] |
|  | December 31,
|  | 2016 |  | 2015
Compensation and related expenses |  | $ | 3,089 |  |  | $ | 3,082 |
Facility construction costs |  |  | 804 |  |  |  | 415 |
Research grants |  |  | 463 |  |  |  | 381 |
Clinical trial costs |  |  | 227 |  |  |  | 252 |
Professional fees |  |  | 802 |  |  |  | 210 |
Deferred Rent |  |  | 231 |  |  |  | - |
Other |  |  | 880 |  |  |  | 438 |
Total |  | $ | 6,496 |  |  | $ | 4,778 |

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