Quarterly report pursuant to Section 13 or 15(d)

Note 1 - Organization and Business (Details Textual)

v3.19.1
Note 1 - Organization and Business (Details Textual)
1 Months Ended 3 Months Ended
Mar. 31, 2019
USD ($)
$ / shares
shares
Feb. 28, 2019
USD ($)
$ / shares
shares
May 31, 2014
USD ($)
shares
Mar. 31, 2019
USD ($)
$ / shares
shares
Mar. 31, 2018
USD ($)
Dec. 31, 2018
$ / shares
Number of Countries in which Entity Operates 60     60    
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares $ 1.45     $ 1.45   $ 2.55
Proceeds from Issuance of Private Placement | $   $ 250,000 $ 10,000,000 $ 250,000  
Warrants, Public Offering [Member]            
Class of Warrant or Right, Number of Securities Called by Warrants or Rights   1,428,750        
Warrants and Rights Outstanding, Term   5 years        
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares   $ 0.50        
Underwrite Warrants [Member]            
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 141,850 141,850   141,850    
Warrants, Private Offering [Member]            
Class of Warrant or Right, Number of Securities Called by Warrants or Rights   178,571        
Warrants and Rights Outstanding, Term   5 years        
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares   $ 0.50        
Public Offering [Member]            
Proceeds from Issuance or Sale of Equity, Total | $   $ 2,000,000        
Stock Issued During Period, Shares, New Issues   5,715,000        
Proceeds from Stock Options Exercised | $ $ 198,000 $ 198,000        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 567,400 567,400        
Private Placement [Member]            
Stock Issued During Period, Shares, New Issues   714,286 2,000,000