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OIL AND NATURAL GAS PROPERTIES AND ASSET RETIREMENT OBLIGATION (Details)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Feb. 28, 2018
USD ($)
party
Oct. 31, 2017
USD ($)
Mar. 31, 2018
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Sep. 30, 2017
USD ($)
Oil and Natural Gas Properties [Line Items]            
Proceeds from the sale of oil and natural gas properties       $ 770 $ 1,238  
Income taxes receivable       2,231   $ 1,145
Gain on sale of oil and natural gas properties       2,250 0  
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]            
Asset retirement obligation as of beginning of period   $ 6,863   6,863    
Obligation incurred on new well drilled       9    
Liabilities associated with properties sold       (1,752)    
Revision of estimated obligation       (323)    
Accretion expense       211 $ 296  
Payments       (589)    
Foreign currency translation adjustment       (200)    
Asset retirement obligation as of end of period       4,219    
Less current portion       (410)   (1,231)
Asset retirement obligation, long-term       3,809   $ 5,632
Pouce Coupe            
Oil and Natural Gas Properties [Line Items]            
Proceeds from the sale of oil and natural gas properties   $ 79        
Income taxes receivable       37    
Red Earth            
Oil and Natural Gas Properties [Line Items]            
Proceeds from the sale of oil and natural gas properties $ 1,360          
Income taxes receivable       752    
Number of separate independent third parties | party 2          
Percent difference in capitalized costs divided by proved reserves if the gain is recorded as opposed to being credited against the full-cost pool 322.00%          
Gain on sale of oil and natural gas properties       2,135    
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]            
Liabilities associated with properties sold       $ (1,666)    
Stolberg            
Oil and Natural Gas Properties [Line Items]            
Proceeds from the sale of oil and natural gas properties $ 120          
Gain on sale of oil and natural gas properties     $ 115