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3. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Summary Of Significant Accounting Policies Tables    
Asset retirement obligation at January 1, $ 189 $ 89
Accretion expense 31 40
Obligations incurred for acquisition 19 87
Obligations settled - assets sold 0 (3)
Changes in estimates 7 (24)
Asset retirement obligation at December 31, $ 246 $ 189