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CAPITAL STOCK - Disclosure of detailed information about number and weighted average exercise prices of share options (Details)
 12 Months Ended
Dec. 31, 2020
Share
$ / shares
Dec. 31, 2019
Share
$ / shares
Disclosure of terms and conditions of share-based payment arrangement [abstract]    
Number of share options outstanding in share-based payment arrangement at beginning of period | Share 6,714,700 6,775,000
Weighted average exercise price of share options outstanding in share-based payment arrangement at beginning of period | $ / shares $ 1.30 $ 1.16
Number of share options granted in share-based payment arrangement | Share 1,645,500 1,740,000
Weighted average exercise price of share options granted in share-based payment arrangement | $ / shares $ 2.62 $ 1.71
Number of share options exercised in share-based payment arrangement | Share (1,967,800) (1,790,300)
Weighted average exercise price of share options exercised in share-based payment arrangement | $ / shares $ 1.10 $ 1.18
Number of share options forfeited in share-based payment arrangement | Share (10,000) (10,000)
Weighted average exercise price of share options forfeited in share-based payment arrangement | $ / shares $ 1.70 $ 1.45
Number of share options outstanding in share-based payment arrangement at end of period | Share 6,382,400 6,714,700
Weighted average exercise price of share options outstanding in share-based payment arrangement at end of period | $ / shares $ 1.70 $ 1.30
Number of share options exercisable in share-based payment arrangement | Share 6,372,400  
Weighted average exercise price of share options exercisable in share-based payment arrangement | $ / shares $ 1.70