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SUBSEQUENT EVENTS (Details)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Apr. 18, 2021
USD ($)
Apr. 08, 2021
USD ($)
May 14, 2021
USD ($)
lot
Apr. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2021
USD ($)
lot
Mar. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Subsequent Event [Line Items]                  
Curtailment gain         $ 0 $ 0 $ 0 $ 1,699  
Proceeds from sale of oil and natural gas assets             0 594  
Income taxes receivable         474   474   $ 472
Kaupulehu Developments                  
Subsequent Event [Line Items]                  
Sale of interest in leasehold land         $ 0 $ 0 $ 485 0  
Kaupulehu Developments | KD Kaupulehu LLLP Increment I                  
Subsequent Event [Line Items]                  
Number of single family lots sold | lot             2    
Investment in land development partnerships                  
Subsequent Event [Line Items]                  
Cash distribution from equity method investment             $ 2,205 $ 0  
Subsequent Event | Paycheck Protection Program Loan                  
Subsequent Event [Line Items]                  
Loan amount forgiven $ 147                
Subsequent Event | Postretirement Medical                  
Subsequent Event [Line Items]                  
Curtailment gain       $ 2,000          
Subsequent Event | Kaupulehu Developments | KD Kaupulehu LLLP Increment I                  
Subsequent Event [Line Items]                  
Sale of interest in leasehold land     $ 548            
Number of single family lots sold | lot     3            
Subsequent Event | Barnwell Industries Inc | Hillsdown, Alberta, Canada                  
Subsequent Event [Line Items]                  
Proceeds from sale of oil and natural gas assets   $ 138              
Income taxes receivable   70              
Subsequent Event | Barnwell Industries Inc | North Twining, Alberta, Canada                  
Subsequent Event [Line Items]                  
Payments to acquire oil and natural gas properties   $ 340              
Subsequent Event | Investment in land development partnerships                  
Subsequent Event [Line Items]                  
Cash distribution from equity method investment     $ 1,554