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Note 5 - Accrued Expenses (Tables)
12 Months Ended
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