Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Narrative (Details)

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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