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Note 15 - Net Loss Per Share (Tables)
6 Months Ended
Jun. 30, 2019
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,
 
   
2019
   
2018
   
2019
   
2018
 
Convertible debt
   
4,882,922
     
4,291,436
     
4,746,243
     
3,969,963