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Note 13 - Net Loss Per Share (Tables)
6 Months Ended
Jun. 30, 2021
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,

 
  

2021

  

2020

  

2021

  

2020

 

Convertible debt

  2,657,697   5,482,166   2,631,484   5,376,040