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Note 5 - Property and Equipment (Tables)
 3 Months Ended
Mar. 31, 2020
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
March 31,
2020
    
December 31,
2019
  
Laboratory equipment
   $
534,577
     $
534,577
  
Leasehold improvements
    
115,605
      
115,605
  
Other furniture, fixtures & equipment
    
11,736
      
11,736
  
Total property and equipment
    
661,918
      
661,918
  
Accumulated depreciation and amortization
    
(652,306
 )    
(651,312
 )
Property and equipment, net
   $
9,612
     $
10,606