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Note 4 - Balance Sheet Components (Tables)
6 Months Ended
Jun. 30, 2014
Disclosure Text Block Supplement [Abstract]  
Scedule of Property, Equipment and Other Assets [Table Text Block]
   

June 30,

2014

   

December 31,

2013

 

Property and equipment:

               

Laboratory equipment

  $ 485,767     $ 474,603  

Leasehold improvements

    115,605       115,605  

Other furniture, fixtures & equipment

    28,685       28,685  

Total property and equipment

    630,057       618,893  

Accumulated depreciation and amortization

    (526,410 )     (498,666 )

Property and equipment, net

  $ 103,647     $ 120,227