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Note 19 - Net Loss Per Share (Tables)
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Notes Tables    
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
   
Three-months Ended
March 31,
 
   
2020
   
2019
 
Convertible debt
   
5,338,973
     
4,628,234
 
   
2019
   
2018
 
Convertible debt
   
4,930,555
     
4,154,760