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FAIR VALUE MEASUREMENTS (Details 1) - Recurring Measurements [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Net Asset (Liability) [RollForward]    
Fair value $ (1,284) $ (1,062)
Total net losses included in:    
Other comprehensive loss (12) (44)
Fair value adjustments included in net loss:    
Net realized losses (gains) on oil price risk derivatives (75) 316
Net unrealized gains on oil price risk derivatives 1,634 266
Retirement expense $ (45) $ (585)
Offset of derivative assets and liabilities  
Transfer from Level 1 to Level 2  
Acquisition of investment $ 238  
Discount negotiated on settlement 77  
Cash settlements paid (received) 769 $ (175)
Fair value 1,302 (1,284)
Level 1 [Member] | Sutter Gold Mining Company [Member] | Equity Securities [Member]    
Fair Value, Net Asset (Liability) [RollForward]    
Fair value 25 69
Total net losses included in:    
Other comprehensive loss (12) (44)
Fair value adjustments included in net loss:    
Transfer from Level 1 to Level 2 $ (13)  
Fair value 25
Level 2 [Member] | Crude Oil Derivatives Liability[Member]    
Fair Value, Net Asset (Liability) [RollForward]    
Fair value (280)
Fair value adjustments included in net loss:    
Net realized losses (gains) on oil price risk derivatives $ (40)  
Net unrealized gains on oil price risk derivatives   266
Offset of derivative assets and liabilities $ 40 $ 14
Fair value
Level 2 [Member] | Crude Oil Derivatives Assets [Member]    
Fair Value, Net Asset (Liability) [RollForward]    
Fair value $ 14
Fair value adjustments included in net loss:    
Net realized losses (gains) on oil price risk derivatives $ (35) 316
Net unrealized gains on oil price risk derivatives 1,634  
Offset of derivative assets and liabilities (40) (14)
Cash settlements paid (received) 75 $ (316)
Fair value $ 1,634
Level 2 [Member] | Sutter Gold Mining Company [Member] | Equity Securities [Member]    
Fair Value, Net Asset (Liability) [RollForward]    
Fair value
Fair value adjustments included in net loss:    
Transfer from Level 1 to Level 2 $ 13  
Fair value 13
Level 3 [Member] | Executive Retirement Program Liability [Member]    
Fair Value, Net Asset (Liability) [RollForward]    
Fair value (1,309) $ (865)
Fair value adjustments included in net loss:    
Retirement expense (45) (585)
Discount negotiated on settlement 77  
Cash settlements paid (received) 694 141
Fair value $ (583) $ (1,309)
Level 3 [Member] | Anfield Resources Inc. [Member] | Equity Securities [Member]    
Fair Value, Net Asset (Liability) [RollForward]    
Fair value
Fair value adjustments included in net loss:    
Net unrealized gains on oil price risk derivatives  
Acquisition of investment $ 238  
Fair value $ 238