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Note 14 - Selected Quarterly Financial Data (unaudited) (Tables)
12 Months Ended
Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Quarterly Financial Information [Table Text Block]
   

2013 Quarter Ended

 
   

March 31

   

June 30

   

September 30

   

December 31

 

Revenue from grants

  $ 797,040     $ 441,561     $ 1,004,211     $ 174,738  

Net loss

    (696,797 )     (526,284 )     (190,148 )     (871,714 )

Net loss per share

    (0.03 )     (0.02 )     (0.01 )     (0.04 )
   

2012 Quarter Ended

 
   

March 31

   

June 30

   

September 30

   

December 31

 

Revenue from grants

  $ 854,063     $ 705,698     $ 638,000     $ 459,566  

Net loss

    (730,513 )     (497,763 )     (296,779 )     (610,085 )

Net loss per share

    (0.04 )     (0.03 )     (0.02 )     (0.03 )