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Note 6 - Stockholders' Equity (Deficiency) (Details Textual)
$ / shares in Units, $ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Oct. 27, 2017
USD ($)
$ / shares
shares
Sep. 29, 2017
USD ($)
$ / shares
shares
Jun. 16, 2017
USD ($)
shares
Jun. 16, 2017
CAD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
shares
Jun. 30, 2018
$ / shares
shares
Jun. 30, 2018
$ / shares
$ / shares
shares
Mar. 31, 2018
USD ($)
$ / shares
shares
Jun. 30, 2018
USD ($)
$ / shares
shares
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2015
Jun. 30, 2018
USD ($)
$ / shares
Dec. 31, 2017
$ / shares
Dec. 31, 2017
USD ($)
$ / shares
Jun. 16, 2017
$ / shares
shares
Common Stock, Dividends, Per Share, Declared | $ / shares                 $ 0              
Common Stock, No Par Value | $ / shares                         $ 0   $ 0  
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares                         $ 0.52   $ 0.48  
Proceeds from Warrant Exercises | $                 $ 6,600 $ 0            
Stock Issued During Period, Value, New Issues | $                 2,551,500              
Proceeds from Issuance of Private Placement | $                 $ 2,280,142 $ 785,728            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross                 2,130,000   725,000          
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares                 $ 0.47   $ 0.42          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value | $                         $ 74,590   $ 0  
Employee Stock Options 1 [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period           5 years 5 years                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross           710,000 710,000                  
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | (per share)           $ 0.54 $ 0.42                  
Employee Stock Options 2 [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period           5 years 5 years                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross           1,275,000 1,275,000                  
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares             $ 0.50                  
Employee Stock Options 3 [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period           5 years 5 years                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross           145,000 145,000                  
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | (per share)           $ 0.54 $ 0.42                  
2015 Stock Options Plan [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Outstanding Stock Maximum                       10.00%        
Common Stock, Capital Shares Reserved for Future Issuance, Percentage                       10.00%        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period           25,000 25,000 75,000                
2015 Stock Options Plan [Member] | Maximum [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period                       10 years        
Private Placement [Member]                                
Stock Issued During Period, Value, New Issues | $               $ 2,551,500                
Stock Issued During Period, Shares, New Issues               7,290,000                
Shares Issued, Price Per Share | $ / shares               $ 0.35                
Proceeds from Issuance of Private Placement $ 45,011 $ 1,010,763 $ 790,281 $ 1,045                        
Units Issued During the Period, Units, New Issues 128,600 2,887,895 2,323,779 2,323,779                        
Units Issued During the Period, Price Per Unit | (per share) $ 0.35 $ 0.35   $ 0.45                       $ 0.34
Number of Common Shares per Unit 1 1   1                       1
Number of Warrants Per Unit 1 1   1                       1
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right 1 1   1                       1
Class of Warrant or Right, Term 1 year 1 year 1 year 1 year                        
Private Placement [Member] | Commission Fees [Member]                                
Payments of Stock Issuance Costs | $               $ 253,750                
Private Placement [Member] | Other Stock Issuance Fees [Member]                                
Payments of Stock Issuance Costs | $               $ 17,608     $ 25,816          
Warrants Exercised Subsequent to the Year Ended December 31, 2017 [Member]                                
Stock Issued During Period, Shares, Warrants Exercised               15,000 1,200,000              
Class of Warrant or Right, Exercise Price of Warrants or Rights | (per share)           $ 0.65 $ 0.65 $ 0.44         $ 0.50      
Proceeds from Warrant Exercises | $               $ 6,600                
Warrants Exercised in December 2017 [Member]                                
Stock Issued During Period, Shares, Warrants Exercised         121,111                      
Class of Warrant or Right, Exercise Price of Warrants or Rights | (per share)                           $ 0.55 $ 0.43  
Proceeds from Warrant Exercises | $         $ 52,310                      
Warrants Exercisable in the First Six Months Following Closing [Member] | Private Placement [Member]                                
Class of Warrant or Right, Exercise Price of Warrants or Rights | (per share) $ 0.44 $ 0.44   $ 0.55                        
Warrants Exercisable From 7 to 12 Months Following Closing [Member] | Private Placement [Member]                                
Class of Warrant or Right, Exercise Price of Warrants or Rights | (per share) $ 0.52 $ 0.52   $ 0.65