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Summary of Significant Accounting Policies - Narrative (Details) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2024 USD ($) | Mar. 31, 2023 USD ($) | Mar. 31, 2024 USD ($) Segment | Mar. 31, 2023 USD ($) | Sep. 30, 2023 USD ($)
Property Plant And Equipment [Line Items] |  |  |  |  |
Accounts receivable, net | $ 9,373,000 |  | $ 9,373,000 |  | $ 712,000
Total operating revenues | 18,113,000 | $ 21,294,000 | 32,098,000 | $ 31,882,000 |
Proceeds from grower's support payments | 1,805,000 |  | $ 1,805,000 |  |
Number of business segments | Segment |  |  | 2 |  |
Net Income (loss) attributable to subsidiary | (209,000) | (344,000) | $ (718,000) | (380,000) |
US Treasury Bill Securities |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |
Amortization cost of securities held to maturity | 2,522,000 |  | 2,522,000 |  |
Citree |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |
Net Income (loss) attributable to subsidiary | $ (427,000) | $ (703,000) | $ (1,466,000) | (776,000) |
Ownership interest (as a percent) | 51.00% |  | 51.00% |  |
Operating Expense |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |
Proceeds from grower's support payments | $ 1,570,000 |  | $ 1,570,000 |  |
Inventories |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |
Proceeds from grower's support payments | 235,000 |  | 235,000 |  |
Citrus |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |
Accounts receivable, net | $ 8,604,000 |  | 8,604,000 |  | $ 394,000
Grove Management Services |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |
Total operating revenues |  |  | 1,395,000 | 551,000 |
Operating expenses |  |  | $ 890,000 | $ 307,000 |

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