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PLANT AND EQUIPMENT AND MINERAL PROPERTIES (Narrative) (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
May 03, 2023
USD ($)
Feb. 14, 2023
USD ($)
subsidiary
$ / shares
Feb. 10, 2023
USD ($)
mi
a
purchaseAgreement
Mar. 31, 2023
USD ($)
Mar. 31, 2022
USD ($)
Dec. 31, 2022
USD ($)
Property, Plant and Equipment [Line Items]            
Depreciation expense       $ 655 $ 813  
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       116,450 0  
Restricted Cash And Cash Equivalents Held For Sale       0   $ 3,590
Plus: release of restricted cash related to sale of assets       3,475 0  
Additions to property, plant and equipment       2,042 398  
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       116,450    
Disposal Group, Cash To Be Received       119,460    
Notes Receivable, Amortized cost       59,460    
Disposal Group, Including Discontinued Operation, Assets   $ 3,340        
Restricted Cash And Cash Equivalents Held For Sale       3,590    
Plus: release of restricted cash related to sale of assets       3,480    
Alta Mesa Divestiture | Subsequent Event            
Property, Plant and Equipment [Line Items]            
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          
Nichols Ranch            
Property, Plant and Equipment [Line Items]            
Depreciation       $ 70 $ 50