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Note 19 - Selected Quarterly Financial Data (Unaudited) (Tables)
12 Months Ended
Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Quarterly Financial Information [Table Text Block]

(in thousands, except per share data)

 

Quarters Ended

 
   

March 31

   

June 30

   

September 30

   

December 31

 

2014

                               

Total revenue

  $ 125     $ 125     $ 125     $ 125  

Net loss

    (5,423

)

    (6,673

)

    (6,942

)

    (6,455

)

Basic and diluted net loss per share

    (0.33

)

    (0.38

)

    (0.35

)

    (0.32

)

                                 

2013

                               

Total revenue

  $ 125     $ 125     $ 125     $ 125  

Net loss

    (651

)

    421       (4,072

)

    (3,949

)

Non-cash deemed dividend from beneficial conversion feature on convertible preferred stock

    (4,601

)

 

   

   

 

Basic and diluted net loss available to common shareholders per share

    (0.48

)

    0.03       (0.30

)

    (0.29

)