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INVESTMENTS - INVESTMENT IN KUKIO RESORT LAND DEVELOPMENT PARTNERSHIP (Details) $ in Thousands |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Nov. 27, 2013 USD ($) partnership | Dec. 31, 2020 USD ($) lot | Dec. 31, 2019 USD ($) | Sep. 30, 2017 a | Sep. 30, 2016 | Sep. 30, 2020 USD ($) | Mar. 07, 2019
Investment Holdings [Line Items] |  |  |  |  |  |  |
Equity in income (loss) of affiliates |  | $ 1,054 | $ (43) |  |  |  |
Investment in Kukio Resort Land Development Partnerships |  | 88 |  |  |  | $ 901 |
Investment in land development partnerships |  |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |  |
Number of limited liability limited partnerships formed | partnership | 2 |  |  |  |  |  |
Cumulative cash distributions from Kukio Resort Land Development Partnerships, made to date |  | 45,000 |  |  |  |  |
Cumulative cash distributions from Kukio Resort Land Development Partnerships, partial payment preferred return |  | 459 |  |  |  |  |
Cumulative cash distributions from Kukio Resort land development Partnerships, preferred return |  | 656 |  |  |  |  |
Cash distribution from equity method investment |  | 1,712 | 0 |  |  |  |
Equity in income (loss) of affiliates |  | 1,054 | $ (43) |  |  |  |
Difference between carrying amount and underlying equity |  | 263 |  |  |  |  |
Basis difference adjustment |  | 20 |  |  |  |  |
Investment in Kukio Resort Land Development Partnerships |  | $ 88 |  |  |  | $ 901 |
KD Kukio Resorts LLLP | Investment in land development partnerships |  |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |  |
Ownership interest acquired | 19.60% |  |  |  |  |  |
KD Kaupulehu, LLLP | Investment in land development partnerships |  |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |  |
Ownership interest acquired | 19.60% |  |  |  |  |  |
KD Maniniowali 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% |  |  |  |  |
KD Kona 2013 LLLP | Investment in land development partnerships |  |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |  |
Ownership interest acquired | 75.00% |  |  |  |  |  |
KKM Makai LLLP | Investment in land development partnerships |  |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |  |
Ownership interest acquired | 34.45% |  |  |  |  |  |
KD Kaupulehu LLLP Increment I | Investment in land development partnerships |  |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |  |
Number of residential lots remaining to be sold | lot |  | 15 |  |  |  |  |
KD Kaupulehu, LLLP | KD Acquisition II, LP | Investment in land development partnerships |  |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |  |
Ownership interest acquired |  |  |  |  |  |  | 55.00%
Kaupulehu Developments | KD Kaupulehu LLLP Increment II |  |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |  |
Number of lots developed |  |  |  | 2 |  |  |
Number of single family lots sold |  |  |  | 1 | 1 |  |
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% |  |  |  |  |
Non-controlling Interests | Investment in land development partnerships |  |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |  |
Cash distribution from equity method investment |  | $ 155 |  |  |  |  |
Maximum | Kaupulehu Developments | KD Kaupulehu LLLP Increment II |  |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |  |
Increment II lot size | a |  |  |  | 3 |  |  |
Minimum | Investment in land development partnerships |  |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |  |
Cumulative cash distributions from Kukio Resort Land Development Partnerships, threshold | $ 45,000 |  |  |  |  |  |
Minimum | Kaupulehu Developments | KD Kaupulehu LLLP Increment II |  |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |  |
Increment II lot size | a |  |  |  | 2 |  |  |

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