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Note 7 - Other Assets
 12 Months Ended
Dec. 31, 2016
Notes to Financial Statements  
Other Assets Disclosure [Text Block]
7.
 Other Assets
 
Other assets consist of the following:
 
 
 
December 31,
 
 
 
2016
 
 
2015
 
Offering costs
   $
180,456
     $
—
  
Clinical studies deposits
    
—
      
160,400
  
Other
    
52,219
      
21,087
  
Total
   $
232,675
     $
181,487