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FINANCIAL INSTRUMENTS (Details 2) - USD ($)
Jun. 30, 2021
Dec. 31, 2020
Statement [Line Items]    
Amounts receivable $ 527,000 $ 529,000
Long-term investments 4,510,000 4,176,000
Warrant liability 249,000 $ 278,000
Level 1 of fair value hierarchy [Member]    
Statement [Line Items]    
Cash 26,814,000  
Amounts receivable 0  
Long-term investments 4,408,000  
Total financial assets 31,222,000  
Warrant liability 0  
Total financial liabilities 0  
Level 2 of fair value hierarchy [Member]    
Statement [Line Items]    
Cash 0  
Amounts receivable 527,000  
Long-term investments 0  
Total financial assets 527,000  
Warrant liability 0  
Total financial liabilities 0  
Level 3 of fair value hierarchy [Member]    
Statement [Line Items]    
Cash 0  
Amounts receivable 0  
Long-term investments 102,000  
Total financial assets 102,000  
Warrant liability (1,307,000)  
Total financial liabilities $ (1,307,000)