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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 ($)
partnership
Mar. 31, 2019
USD ($)
lot
Mar. 31, 2018
USD ($)
Mar. 31, 2019
USD ($)
lot
Mar. 31, 2018
USD ($)
Mar. 07, 2019
Investment Holdings [Line Items]            
Equity in loss of affiliates   $ 207 $ 80 $ 286 $ 233  
Investment in land development partnerships            
Investment Holdings [Line Items]            
Number of limited liability limited partnerships formed | partnership 2          
Cash distribution from equity method investment       314 0  
Cumulative cash distributions from Kukio Resort Land Development Partnerships made to date       45,000    
Equity in loss of affiliates   207 80 286 233  
Difference between carrying amount and underlying equity   313   313    
Basis difference adjustment   $ 0 $ 0 $ 1 3  
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