v3.19.3
Note 9 - Warrants - Details of Warrants (Details)
Dec. 31, 2018
$ / shares
shares
Warrants for Series A Convertible Preferred Stock Issued in November, 2015 [Member]  
us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 | $ / shares $ 0.2276
us-gaap_ClassOfWarrantOrRightOutstanding 198
Warrants for Series A Convertible Preferred Stock Issued in January, 2016 [Member]  
us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 | $ / shares $ 0.2276
us-gaap_ClassOfWarrantOrRightOutstanding 132
Warrants for Series A Convertible Preferred Stock [Member]  
us-gaap_ClassOfWarrantOrRightOutstanding 330