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CASH AND CASH EQUIVALENTS (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash held in:        
Cash and cash equivalents $ 5,292,833 $ 9,242,809 $ 17,507,157 $ 22,954,571
United States dollars        
Cash held in:        
Cash 4,489,501 8,173,582 16,989,119  
Canadian dollars        
Cash held in:        
Cash 525,371 483,730 70,112  
Euros        
Cash held in:        
Cash $ 277,961 $ 585,497 $ 447,926