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INVESTMENTS - INVESTMENT IN KUKIO RESORT LAND DEVELOPMENT PARTNERSHIP (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Nov. 27, 2013
USD ($)
partnership
Mar. 31, 2020
USD ($)
lot
Mar. 31, 2019
USD ($)
Mar. 31, 2020
USD ($)
lot
Mar. 31, 2019
USD ($)
Mar. 07, 2019
Investment Holdings [Line Items]            
Equity in loss of affiliates   $ (25) $ (207) $ (68) $ (286)  
Investment in land development partnerships            
Investment Holdings [Line Items]            
Number of limited liability limited partnerships formed | partnership 2          
Cash distribution from equity method investment       0 314  
Cumulative cash distributions from Kukio Resort Land Development Partnerships made to date       45,000    
Equity in loss of affiliates   (25) $ (207) (68) (286)  
Difference between carrying amount and underlying equity   $ 292   292    
Basis difference adjustment       $ 5 1  
K D Kukio Resorts LLLP | Investment in land development partnerships            
Investment Holdings [Line Items]            
Ownership interest acquired 19.60%          
Indirectly Acquired Interest | Investment in land development partnerships            
Investment Holdings [Line Items]            
Aggregate cost $ 5,140          
KD Acquisition, LLLP | Investment in land development partnerships            
Investment Holdings [Line Items]            
Ownership interest acquired   19.60%   19.60%    
K D Maniniowali L L L P | Investment in land development partnerships            
Investment Holdings [Line Items]            
Ownership interest acquired 19.60%          
KKM Makai LLLP | Investment in land development partnerships            
Investment Holdings [Line Items]            
Ownership interest acquired 34.45%          
KD Kaupulehu, LLLP | Investment in land development partnerships            
Investment Holdings [Line Items]            
Ownership interest acquired 19.60%          
KD Kaupulehu LLLP Increment I | Investment in land development partnerships            
Investment Holdings [Line Items]            
Number of residential lots remaining to be sold | lot   19   19    
KD Kaupulehu, LLLP | KD Acquisition II, LP | Investment in land development partnerships            
Investment Holdings [Line Items]            
Ownership interest acquired           55.00%
Replay | KD Acquisition II, LP | Investment in land development partnerships            
Investment Holdings [Line Items]            
Ownership interest acquired           45.00%
Barnwell Industries Inc | KD Acquisition II, LP | Investment in land development partnerships            
Investment Holdings [Line Items]            
Ownership interest acquired   10.80%   10.80%    
Barnwell Hawaiian Properties, Inc. | KKM Makai LLLP | Investment in land development partnerships            
Investment Holdings [Line Items]            
Preferred Return to be Received as Percentage from KKM 100.00%          
Non-controlling Interests | Investment in land development partnerships            
Investment Holdings [Line Items]            
Cash distribution from equity method investment         $ 38  
Maximum | Barnwell Hawaiian Properties, Inc. | KKM Makai LLLP | Investment in land development partnerships            
Investment Holdings [Line Items]            
Preferred Return, Amount, from KKM $ 1,000          
Minimum | Investment in land development partnerships            
Investment Holdings [Line Items]            
Cumulative cash distributions from Kukio Resort Land Development Partnerships, threshold $ 45,000