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Note 5 - Accrued Expenses (Tables) | 12 Months Ended
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Dec. 31, 2013
Payables and Accruals [Abstract] |
Schedule of Accrued Liabilities [Table Text Block] |
December 31, |  | 2013 |  |  | 2012 |
Research and development costs |  | $ | 1,795 |  |  | $ | 651 |
Accrued compensation |  |  | 2,566 |  |  |  | 401 |
Other |  |  | 342 |  |  |  | 698 |
Total |  | $ | 4,703 |  |  | $ | 1,750 |

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- Definition Tabular disclosure of the components of accrued liabilities. + References No definition available. + Details
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