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Note 14 - Net Loss Per Share (Tables)
6 Months Ended
Jun. 30, 2020
Notes Tables  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
   
Three-months Ended
June 30,
   
Six-months Ended
June 30,
 
   
2020
   
2019
   
2020
   
2019
 
Convertible debt
   
5,482,166
     
4,882,922
     
5,376,040
     
4,746,243