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FAIR VALUE MEASUREMENTS (Details 1) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Fair value adjustments included in net loss:    
Issuance of warrants $ 1,030
Recurring Measurements [Member]    
Fair Value, Net Asset (Liability) [RollForward]    
Fair value 1,302 (1,284)
Total net losses included in:    
Other comprehensive loss 3 (12)
Fair value adjustments included in net loss:    
Net realized losses on oil price risk derivatives   (75)
Net unrealized gains on oil price risk derivatives   1,634
Net unrealized gain on warrant valuation (210)  
Net unrealized loss on Anfield Shares (58)  
Retirement expense   (45)
Transfer from Level 1 to Level 2  
Issuance of warrants 1,240  
Acquisition of investment 750 238
Discount negotiated on settlement   77
Offset of derivative assets and liabilities (194)  
Cash settlements paid (received) (857) 769
Fair value 1,976 1,302
Level 1 [Member] | Recurring Measurements [Member]    
Fair value adjustments included in net loss:    
Issuance of warrants
Level 1 [Member] | Recurring Measurements [Member] | Sutter Gold Mining Company [Member] | Equity Securities [Member]    
Fair Value, Net Asset (Liability) [RollForward]    
Fair value 25
Total net losses included in:    
Other comprehensive loss   (12)
Fair value adjustments included in net loss:    
Net realized losses on oil price risk derivatives  
Net unrealized gains on oil price risk derivatives  
Retirement expense  
Transfer from Level 1 to Level 2 (13)
Acquisition of investment  
Discount negotiated on settlement  
Offset of derivative assets and liabilities  
Cash settlements paid (received)  
Fair value
Level 1 [Member] | Recurring Measurements [Member] | Anfield Resources, Inc. [Member] | Equity Securities [Member]    
Fair Value, Net Asset (Liability) [RollForward]    
Fair value  
Total net losses included in:    
Other comprehensive loss  
Fair value adjustments included in net loss:    
Net unrealized loss on Anfield Shares (58)  
Acquisition of investment 750 238
Level 2 [Member] | Recurring Measurements [Member]    
Fair value adjustments included in net loss:    
Issuance of warrants
Level 2 [Member] | Recurring Measurements [Member] | Crude Oil Derivatives Liability[Member]    
Fair Value, Net Asset (Liability) [RollForward]    
Fair value
Fair value adjustments included in net loss:    
Net realized losses on oil price risk derivatives (40)
Net unrealized gains on oil price risk derivatives  
Retirement expense  
Transfer from Level 1 to Level 2  
Discount negotiated on settlement  
Offset of derivative assets and liabilities   40
Fair value
Level 2 [Member] | Recurring Measurements [Member] | Crude Oil Derivatives Assets [Member]    
Fair Value, Net Asset (Liability) [RollForward]    
Fair value 1,634
Fair value adjustments included in net loss:    
Net realized losses on oil price risk derivatives 0 (35)
Net unrealized gains on oil price risk derivatives   1,634
Offset of derivative assets and liabilities (194) (40)
Cash settlements paid (received) (1,440) 75
Fair value 1,634
Level 2 [Member] | Recurring Measurements [Member] | Sutter Gold Mining Company [Member] | Equity Securities [Member]    
Fair Value, Net Asset (Liability) [RollForward]    
Fair value 13
Total net losses included in:    
Other comprehensive loss 3  
Fair value adjustments included in net loss:    
Transfer from Level 1 to Level 2   13
Fair value 16 13
Level 3 [Member] | Recurring Measurements [Member]    
Fair value adjustments included in net loss:    
Issuance of warrants 1,030
Level 3 [Member] | Recurring Measurements [Member] | Executive Retirement Program Liability [Member]    
Fair Value, Net Asset (Liability) [RollForward]    
Fair value (583) (1,309)
Fair value adjustments included in net loss:    
Retirement expense   (45)
Discount negotiated on settlement   77
Cash settlements paid (received) 583 694
Fair value (583)
Level 3 [Member] | Recurring Measurements [Member] | Warrant [Member]    
Fair Value, Net Asset (Liability) [RollForward]    
Fair value
Fair value adjustments included in net loss:    
Net unrealized gain on warrant valuation (210)  
Issuance of warrants 1,240  
Fair value 1,030
Level 3 [Member] | Recurring Measurements [Member] | Anfield Resources, Inc. [Member] | Equity Securities [Member]    
Fair Value, Net Asset (Liability) [RollForward]    
Fair value 238  
Fair value adjustments included in net loss:    
Fair value $ 930 $ 238