Quarterly report [Sections 13 or 15(d)]

Summary of Significant Accounting Policies - Narrative (Details)

v3.26.1
Summary of Significant Accounting Policies - Narrative (Details)
3 Months Ended 9 Months Ended
Jun. 23, 2026
USD ($)
Oct. 24, 2025
Jun. 30, 2026
USD ($)
a
boardMember
Dec. 31, 2025
USD ($)
Jun. 30, 2025
USD ($)
Jun. 30, 2026
USD ($)
a
boardMember
Jun. 30, 2025
USD ($)
Jun. 18, 2026
USD ($)
a
Nov. 14, 2025
USD ($)
Oct. 01, 2025
USD ($)
Sep. 30, 2025
USD ($)
Oct. 01, 2024
USD ($)
Disaggregation Of Revenue [Line Items]                        
Accounts receivable, net     $ 591,000     $ 591,000         $ 1,014,000  
Total operating revenues     9,040,000   $ 8,390,000 16,267,000 $ 43,264,000          
Lease income     456,000   0 1,756,000 0          
Variable lease income     $ 6,687,000     $ 6,862,000            
Area of land in acres | a     47,300     47,300            
Federally insured limit       $ 250,000   $ 250,000            
Restricted cash     $ 762,000     762,000         762,000  
Proceeds from grower's support payments           0 1,116          
Allowance for credit losses     365,000     365,000         60,000  
Impairment of long-lived assets     $ 0     $ 0 24,966,000          
Number of board members | boardMember     5     5            
CGSD agreement interest rate   5.00%                    
Financing receivable, after allowance for credit loss                 $ 5,071,000      
Net Income (loss) attributable to subsidiary     $ (558,000)   (35,000) $ (771,000) $ (167,000)          
Purchase agreement, threshold price per acre $ 12,000                      
Purchase agreement, threshold price per acre, percentage 50.00%                      
Hendry County, Florida                        
Disaggregation Of Revenue [Line Items]                        
Area of land in acres | a               3,280        
Lease agreement, term           10 years            
Lease agreement, purchase option               $ 29,520,000        
Lease agreement, purchase option, per acre               $ 9,000        
Kobie Cattle Company                        
Disaggregation Of Revenue [Line Items]                        
Accounts receivable, net     396,000     $ 396,000         0  
Kobie Cattle Company | Total Revenue | Customer Concentration Risk                        
Disaggregation Of Revenue [Line Items]                        
Concentration risk percentage           48.30% 0.00%          
Kobie Cattle Company | Accounts Receivable | Customer Concentration Risk                        
Disaggregation Of Revenue [Line Items]                        
Concentration risk percentage           67.00%            
Citree                        
Disaggregation Of Revenue [Line Items]                        
Net Income (loss) attributable to subsidiary     $ 1,138,000   $ (71,000) $ (1,573,000) $ (341,000)          
Ownership interest (as a percent)     51.00%   51.00% 51.00% 51.00%          
Company acquired at closing date 49.00%                      
Payments to acquire interest in subsidiaries $ 2,007,000                      
Location, Statement of Income, Balance [Axis]: alco:OperatingExpensesIncome                        
Disaggregation Of Revenue [Line Items]                        
Proceeds from grower's support payments           $ 425,000 $ 691,000          
Location, Statement of Financial Position, Balance [Axis]: us-gaap:InventoryNet                        
Disaggregation Of Revenue [Line Items]                        
Proceeds from grower's support payments, current     $ 0     0         425,000  
Citrus                        
Disaggregation Of Revenue [Line Items]                        
Accounts receivable, net     0     0       $ 575,000 $ 575,000 $ 444,000
Rock and Sand Royalty                        
Disaggregation Of Revenue [Line Items]                        
Total operating revenues     $ 429,000     $ 1,433,000