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OIL AND NATURAL GAS PROPERTIES (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Oct. 31, 2017
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Sep. 30, 2018
Oil and Natural Gas Properties [Line Items]              
Proceeds from sale of oil and natural gas assets         $ 1,519 $ 770  
Income taxes receivable   $ 166     166   $ 2,461
Gain on sale of oil and natural gas properties   0   $ 0 0 2,250  
Acquisition costs         0    
Impairment of assets   0   165 2,413 202  
Future capital expenditure, development of proved undeveloped reserves, over next five years   $ 14,000     $ 14,000    
Pouce Coupe              
Oil and Natural Gas Properties [Line Items]              
Proceeds from sale of oil and natural gas assets $ 79            
Income taxes receivable       $ 37   37  
Red Earth              
Oil and Natural Gas Properties [Line Items]              
Gain on sale of oil and natural gas properties           2,135  
Stolberg              
Oil and Natural Gas Properties [Line Items]              
Gain on sale of oil and natural gas properties           $ 115  
Wood River and Twining              
Oil and Natural Gas Properties [Line Items]              
Acquisition costs     $ 355