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Schedule of Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Allowance for doubtful accounts receivable      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of year $ 30 $ 382 $ 261
Charged to costs and expenses 47 191 215
Deduction (15) (543) (94)
Balance at end of year 62 30 382
Allowance for doubtful notes receivable      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of year 0 102 182
Charged to costs and expenses 0 753 (80)
Deduction 0 (855) 0
Balance at end of year 0 0 102
Deferred tax asset valuation allowance      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of year 984 641 1,273
Charged to costs and expenses 0 343 0
Deduction (176) 0 (632)
Balance at end of year $ 808 $ 984 $ 641