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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($)
3 Months Ended 9 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Mar. 31, 2024
Sep. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Summary Of Significant Accounting Policies [Line Items]                
Rental deposits $ 3,258,000 $ 2,739,000 $ 3,258,000 $ 2,739,000 $ 3,366,000 $ 2,084,000 $ 3,120,000 $ 2,269,000
New rental deposits 1,785,000 1,529,000 5,659,000 4,948,000        
Recognized revenue 1,893,000 1,910,000 4,485,000 4,478,000        
Cash and cash equivalents 12,084,000 10,217,000 12,084,000 10,217,000   10,335,000   $ 10,586,000
Advertising expense 5,000 $ 7,000 23,000 $ 26,000        
Deposits 543,000   543,000     417,000    
Federally insured limit amount 250,000   250,000          
TOT and TBID [Member]                
Summary Of Significant Accounting Policies [Line Items]                
Accrued expenses 117,000   117,000     80,000    
Cash and cash equivalents $ 12,084,000   $ 12,084,000     $ 10,335,000    
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Site Rentals [Member]                
Summary Of Significant Accounting Policies [Line Items]                
Concentration risk, percentage 71.00% 71.00% 67.00% 65.00%        
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Storage Rentals [Member]                
Summary Of Significant Accounting Policies [Line Items]                
Concentration risk, percentage 13.00% 14.00% 16.00% 16.00%        
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Spotting [Member]                
Summary Of Significant Accounting Policies [Line Items]                
Concentration risk, percentage 5.00% 5.00% 5.00% 5.00%        
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Store and Accessory [Member]                
Summary Of Significant Accounting Policies [Line Items]                
Concentration risk, percentage 8.00% 8.00% 7.00% 7.00%