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Note 4 - Balance Sheet Components (Details) - Property and Equipment, and Other Assets (USD $)
Jun. 30, 2014
Dec. 31, 2013
Property and equipment:    
Property and equipment, gross $ 630,057 $ 618,893
Accumulated depreciation and amortization (526,410) (498,666)
Property and equipment, net 103,647 120,227
Laboratory Equipment [Member]
   
Property and equipment:    
Property and equipment, gross 485,767 474,603
Leasehold Improvements [Member]
   
Property and equipment:    
Property and equipment, gross 115,605 115,605
Other Furniture, Fixtures and Equipment [Member]
   
Property and equipment:    
Property and equipment, gross $ 28,685 $ 28,685