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Financing receivable, net - Portfolio of risk rating (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Mar. 31, 2024 | Oct. 01, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2022
--- | --- | --- | --- | --- | --- | --- | ---
Financing receivables, net: |  |  |  |  |  |  |
Financing receivables, gross | $ 13,290 |  |  | $ 12,254 |  |  |
Unearned interest income | (793) |  |  | (859) |  |  |
Allowance for credit losses | (69) | $ (70) |  | 0 | $ 0 | $ 0 | $ 0
Financing receivables, net | 12,428 |  | $ 82 | 11,395 |  |  |
Short-term | 8,710 |  |  | 7,171 |  |  |
Long-term | 3,718 |  |  | 4,224 |  |  |
Low Risk Rating |  |  |  |  |  |  |
Financing receivables, net: |  |  |  |  |  |  |
Financing receivables, gross | 10,248 |  |  | 8,893 |  |  |
Unearned interest income | (389) |  |  | (325) |  |  |
Allowance for credit losses | (30) | (16) |  | 0 | 0 | 0 | 0
Financing receivables, net | 9,829 |  |  | 8,568 |  |  |
Short-term | 7,616 |  |  | 6,281 |  |  |
Long-term | 2,213 |  |  | 2,287 |  |  |
Moderate Risk Rating |  |  |  |  |  |  |
Financing receivables, net: |  |  |  |  |  |  |
Financing receivables, gross | 3,042 |  |  | 3,361 |  |  |
Unearned interest income | (404) |  |  | (534) |  |  |
Allowance for credit losses | (39) | $ (54) |  | 0 | $ 0 | $ 0 | $ 0
Financing receivables, net | 2,599 |  |  | 2,827 |  |  |
Short-term | 1,094 |  |  | 890 |  |  |
Long-term | $ 1,505 |  |  | $ 1,937 |  |  |

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