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FAIR VALUE ACCOUNTING (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Assets:    
Long term debt $ 47,800 $ 49,500
Gold Bar mine    
Assets:    
Impairment of long-lived assets $ 83,800  
Marketable equity securities. | Recurring    
Assets:    
Investments   1,885
Marketable equity securities. | Recurring | Level 1    
Assets:    
Investments   $ 1,885