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FAIR VALUE MEASUREMENTS (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Outstanding warrant liability $ 690 $ 1,030
Recurring Measurements [Member] | Total [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total 861 946
Outstanding warrant liability 690 1,030
Recurring Measurements [Member] | Equity Securities [Member] | Total [Member] | Sutter Gold Mining Company [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable equity securitites 15 16
Recurring Measurements [Member] | Equity Securities [Member] | Total [Member] | Anfield Resources, Inc. [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable equity securitites 846 930
Level 1 [Member] | Recurring Measurements [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total 861 946
Outstanding warrant liability  
Level 1 [Member] | Recurring Measurements [Member] | Equity Securities [Member] | Sutter Gold Mining Company [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable equity securitites 15 16
Level 1 [Member] | Recurring Measurements [Member] | Equity Securities [Member] | Anfield Resources, Inc. [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable equity securitites 846 930
Level 2 [Member] | Recurring Measurements [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total  
Outstanding warrant liability  
Level 2 [Member] | Recurring Measurements [Member] | Equity Securities [Member] | Sutter Gold Mining Company [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable equity securitites
Level 2 [Member] | Recurring Measurements [Member] | Equity Securities [Member] | Anfield Resources, Inc. [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable equity securitites
Level 3 [Member] | Recurring Measurements [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total
Outstanding warrant liability 690 1,030
Level 3 [Member] | Recurring Measurements [Member] | Equity Securities [Member] | Sutter Gold Mining Company [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable equity securitites
Level 3 [Member] | Recurring Measurements [Member] | Equity Securities [Member] | Anfield Resources, Inc. [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable equity securitites