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Note 10 - Convertible Notes Payable (Tables)
6 Months Ended
Jun. 30, 2019
Notes Tables  
Convertible Debt [Table Text Block]
Principal amount
  $
707,000
 
Less unamortized debt discount
   
(24,533
)
Less unamortized debt issuance costs
   
(140,800
)
Notes payable, net of unamortized debt discount and debt issuance costs
  $
541,667