Quarterly report pursuant to Section 13 or 15(d)

9. FAIR VALUE MEASUREMENTS (Details-Fair value measurements)

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9. FAIR VALUE MEASUREMENTS (Details-Fair value measurements) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Assets:    
Assets $ 180 $ 1,586
Liabilities:    
Liabilities 2,072 3,135
Commodity contracts [Member]    
Assets:    
Assets 180 1,586
Liabilities:    
Liabilities 369 1,149
Warrants [Member]    
Liabilities:    
Liabilities 1,703 1,986
Level 1 [Member]    
Assets:    
Assets 180 1,586
Liabilities:    
Liabilities 369 1,149
Level 1 [Member] | Commodity contracts [Member]    
Assets:    
Assets 180 1,586
Liabilities:    
Liabilities 369 1,149
Level 1 [Member] | Warrants [Member]    
Liabilities:    
Liabilities 0 0
Level 2 [Member]    
Assets:    
Assets 0 0
Liabilities:    
Liabilities 0 0
Level 2 [Member] | Commodity contracts [Member]    
Assets:    
Assets 0 0
Liabilities:    
Liabilities 0 0
Level 2 [Member] | Warrants [Member]    
Liabilities:    
Liabilities 0 0
Level 3 [Member]    
Assets:    
Assets 0 0
Liabilities:    
Liabilities 1,703 1,986
Level 3 [Member] | Commodity contracts [Member]    
Assets:    
Assets 0 0
Liabilities:    
Liabilities 0 0
Level 3 [Member] | Warrants [Member]    
Liabilities:    
Liabilities $ 1,703 $ 1,986