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OIL AND NATURAL GAS PROPERTIES (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Oct. 31, 2017
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Sep. 30, 2018
Oil and Natural Gas Properties [Line Items]              
Proceeds from the sale of oil and natural gas assets         $ 1,519 $ 763  
Income taxes receivable   $ 102     102   $ 2,461
Gain on sale of oil and natural gas properties   0   $ 2,250 0 2,250  
Acquisition costs   0          
Impairment of assets   243   37 2,413 37  
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 the sale of oil and natural gas assets $ 72            
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   2,135  
Stolberg              
Oil and Natural Gas Properties [Line Items]              
Gain on sale of oil and natural gas properties       $ 115   $ 115  
Wood River and Twining              
Oil and Natural Gas Properties [Line Items]              
Acquisition costs     $ 355