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Note 6 - Property and Equipment (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
December 31,
    
December 31,
  
   
2017
    
2016
  
                 
Medical equipment
   $
401,719
     $
405,096
  
Office equipment
    
48,888
      
48,888
  
Software
    
257,619
      
257,619
  
Manufacturing equipment
    
34,899
      
34,899
  
Leasehold improvements
    
19,215
      
19,215
  
     
762,340
      
765,717
  
Less accumulated depreciation and amortization
    
(538,724
)
    
(279,601
)
      Total property and equipment, net   $
223,616
     $
486,116