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WARRANTS AND STOCK OPTIONS - Disclosure of number and weighted average remaining contractual life of outstanding share options (Details)
12 Months Ended
Dec. 31, 2020
Share
$ / shares
Dec. 31, 2019
Share
$ / shares
Dec. 31, 2018
Share
$ / shares
Warrants And Stock Options [Line Items]      
Number of stock options | Share 7,075,000 6,150,001 5,200,001
Weighted average exercise price $ 1.19 $ 0.96 $ 0.98
Average remaining contractual life (years) 3 years 14 days    
Range 1 [Member]      
Warrants And Stock Options [Line Items]      
Number of stock options | Share 1,950,000    
Weighted average exercise price $ 0.87    
Average remaining contractual life (years) 3 years 5 months 4 days    
Range 1 [Member] | Bottom of range [Member]      
Warrants And Stock Options [Line Items]      
Exercise price of outstanding share options $ 0.75    
Range 1 [Member] | Top of range [Member]      
Warrants And Stock Options [Line Items]      
Exercise price of outstanding share options 0.90    
Range 2 [Member]      
Warrants And Stock Options [Line Items]      
Exercise price of outstanding share options $ 0.96    
Number of stock options | Share 1,100,000    
Weighted average exercise price $ 0.96    
Average remaining contractual life (years) 8 months 12 days    
Range 3 [Member]      
Warrants And Stock Options [Line Items]      
Number of stock options | Share 2,000,000    
Weighted average exercise price $ 1.19    
Average remaining contractual life (years) 2 years 4 months 13 days    
Range 3 [Member] | Bottom of range [Member]      
Warrants And Stock Options [Line Items]      
Exercise price of outstanding share options $ 1.11    
Range 3 [Member] | Top of range [Member]      
Warrants And Stock Options [Line Items]      
Exercise price of outstanding share options 1.20    
Range 4 [Member]      
Warrants And Stock Options [Line Items]      
Exercise price of outstanding share options $ 1.41    
Number of stock options | Share 200,000    
Weighted average exercise price $ 1.41    
Average remaining contractual life (years) 4 years 10 months 9 days    
Range 5 [Member]      
Warrants And Stock Options [Line Items]      
Exercise price of outstanding share options $ 1.66    
Number of stock options | Share 1,825,000    
Weighted average exercise price $ 1.66    
Average remaining contractual life (years) 4 years 6 months 25 days