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PLANT AND EQUIPMENT AND MINERAL PROPERTIES (Narrative) (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
May 03, 2023
USD ($)
Feb. 14, 2023
USD ($)
subsidiary
$ / shares
Feb. 10, 2023
USD ($)
mi
purchaseAgreement
a
Jun. 30, 2023
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Property, Plant and Equipment [Line Items]                
Depreciation expense       $ 660 $ 870 $ 1,319 $ 1,679  
Number of purchase agreements | purchaseAgreement     2          
Purchase Agreement, acres to purchase | a     37,300          
Purchase Agreement, miles to purchase | mi     58.3          
Purchase Agreement, purchase price     $ 27,500          
Purchase Agreement, payment due at closing     21,600          
Purchase Agreement, deposit payment     5,900          
Purchase Agreement, direct deal costs     $ 1,630          
Gain on sale of assets       2,807   119,257 0  
Restricted Cash And Cash Equivalents Held For Sale           0   $ 3,590
Increase (Decrease) In Restricted Cash           (3,590) 0  
Additions to property, plant and equipment           5,467 705  
Alta Mesa Divestiture                
Property, Plant and Equipment [Line Items]                
Number Of Subsidiaries Sold | subsidiary   3            
Disposal Group, Including Discontinued Operation, Consideration   $ 120,000            
Proceeds from Divestiture of Interest in Consolidated Subsidiaries   60,000            
Disposal Group, Cash Due Prior To Closing   6,000            
Disposal Group, Cash Due At Closing   54,000            
Noncash or Part Noncash Divestiture, Amount of Consideration Received   $ 60,000            
Convertible Note Receivable, Term   2 years            
Convertible Notes Receivable, Interest Rate   8.00%            
Convertible Notes Receivable, Conversion Price Per Share | $ / shares   $ 2.9103            
Convertible Notes Receivable, Premium   20.00%            
Convertible Notes Receivable, Conversion Limitation Per Transaction   $ 10,000            
Convertible Notes Receivable, Conversion Period   30 days            
Gain on sale of assets   $ 116,500            
Disposal Group, Cash To Be Received   119,460            
Notes Receivable, Amortized cost   59,460            
Disposal Group, Including Discontinued Operation, Assets   $ 3,400            
Restricted Cash And Cash Equivalents Held For Sale       3,590        
Increase (Decrease) In Restricted Cash           3,590    
Proceeds from Sale of Productive Assets $ 3,100              
Additions to property, plant and equipment 500              
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment $ 350              
Disposal Group, Including Discontinued Operation, Property, Plant And Equipment, Usage Period 20 years              
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal $ 2,750              
Nichols Ranch                
Property, Plant and Equipment [Line Items]                
Depreciation       $ 80 $ 50 $ 160 $ 50