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Note 13 - Net Loss Per Share (Tables)
3 Months Ended
Mar. 31, 2021
Notes Tables  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
   
Three-months Ended
March 31,
 
   
2021
   
2020
 
Convertible debt
   
5,596,665
     
5,338,973