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COMMITMENTS AND CONTINGENCIES (Detail) - USD ($) | 12 Months Ended
--- | ---
Sep. 30, 2016 | Sep. 30, 2015
Kaupulehu Developments |  |
Commitments and contingencies |  |
Fees to be paid to Nearco | 10.40% |
Percentage of Increment II receipts to be paid to external real estate counsel for services provided in the negotiation and closing of the Increment II transaction | 1.50% |
Oil pipeline release [Member] |  |
Commitments and contingencies |  |
Probable environmental remediation costs | $ 2,200,000 |
Percentage of working interest | 58.00% |
Insurance deductible | $ 80,000 |
Accrual for environmental remediation costs | $ 0 |
Gas leak [Member] |  |
Commitments and contingencies |  |
Percentage of working interest | 50.00% |
Accrual for environmental remediation costs | $ 200,000 |
Minimum | Gas leak [Member] |  |
Commitments and contingencies |  |
Probable environmental remediation costs | 400,000 |
Maximum | Gas leak [Member] |  |
Commitments and contingencies |  |
Probable environmental remediation costs | 800,000 |
Lease Agreements [Member] |  |
Commitments and contingencies |  |
Rental expense | 404,000 | $ 408,000
Minimum rental payments |  |
2017 | 261,000 |
2018 | 138,000 |
2019 | 118,000 |
2020 | 118,000 |
2021 | 118,000 |
Thereafter through 2026 | 130,000 |
Total | $ 883,000 |

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