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Note 15 - Net Loss Per Share (Tables)
9 Months Ended
Sep. 30, 2019
Notes Tables  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
   
Three-months Ended
September 30,
   
Nine-months Ended
September 30,
 
   
2019
   
2018
   
2019
   
2018
 
Convertible debt
   
5,267,610
     
4,950,848
     
4,830,909
     
4,156,305