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5. OIL AND GAS PROPERTIES (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Oil and gas properties subject to amortization $ 68,306 $ 64,655 $ 24,057
Oil and gas properties not subject to amortization 0 0 8,159
Asset retirement costs 163 137 76
Accumulated depreciation, depletion and impairment (11,074) (6,025) (10,237)
Total oil and gas properties, net 57,395 58,767 $ 22,055
Additions [Member]      
Oil and gas properties subject to amortization 3,651 47,561  
Oil and gas properties not subject to amortization 0 0  
Asset retirement costs 26 63  
Accumulated depreciation, depletion and impairment (5,049) (6,441)  
Total oil and gas properties, net (1,372) 41,183  
Disposals [Member]      
Oil and gas properties subject to amortization 0 (7,252)  
Oil and gas properties not subject to amortization 0 (7,870)  
Asset retirement costs 0 (2)  
Accumulated depreciation, depletion and impairment 0 10,653  
Total oil and gas properties, net 0 (4,471)  
Transfers [Member]      
Oil and gas properties subject to amortization 0 289  
Oil and gas properties not subject to amortization 0 (289)  
Asset retirement costs 0 0  
Accumulated depreciation, depletion and impairment 0 0  
Total oil and gas properties, net $ 0 $ 0