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Schedule of Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Allowance for doubtful operating receivables      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of year $ 62 $ 30 $ 382
Charged to costs and expenses 60 47 191
Deduction (80) (15) (543)
Balance at end of year 42 62 30
Allowance for doubtful notes receivable      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of year 0 0 102
Charged to costs and expenses 0 0 753
Deduction 0 0 (855)
Balance at end of year 0 0 0
Deferred tax asset valuation allowance      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of year 808 984 641
Charged to costs and expenses 143 (176) 343
Deduction 0 0 0
Balance at end of year $ 951 $ 808 $ 984