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Note 6 - Convertible Debt (Tables)
 6 Months Ended
Jun. 30, 2017
Notes Tables  
Convertible Debt [Table Text Block]
Note
  
Issue
Date
  
Maturity
Date
 
Conversion
Price
 
 
Interest
Rate
 
 
Total
Principal
2016 Convertible Notes
  
9/27/2016
  
9/27/2017
   $
3.50
      
6.00
 %   $
1,880,000
    
Series B Note
  
3/15/2011
  
6/30/2018
   $
2.74
      
1.00
 %    
550,000
    
Total principal amount  
 
  
 
    
 
      
 
     $
2,430,000