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Financing receivables, net - Portfolio of risk rating (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024	Sep. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023
Financing receivables, net:
Financing receivables, gross	$ 7,111		$ 8,027
Unearned interest income	(631)		(684)
Allowance for credit losses	(89)	$ (35)	(37)	$ (70)	$ (77)	$ 0
Financing receivables, net	6,391		7,306
Short-term	2,727		4,384
Long-term	3,664		2,922
Low Risk Rating
Financing receivables, net:
Financing receivables, gross	5,173		7,153
Unearned interest income	(436)		(599)
Allowance for credit losses	(24)	(21)	(27)	(16)	(16)	0
Financing receivables, net	4,713		6,527
Short-term	1,977		4,013
Long-term	2,736		2,514
Moderate Risk Rating
Financing receivables, net:
Financing receivables, gross	648		874
Unearned interest income	(51)		(85)
Allowance for credit losses	(6)	(8)	(10)	$ (54)	$ (61)	$ 0
Financing receivables, net	591		779
Short-term	401		371
Long-term	190		408
High Risk Rating
Financing receivables, net:
Financing receivables, gross	1,290
Unearned interest income	(144)
Allowance for credit losses	(59)	$ (6)
Financing receivables, net	1,087
Short-term	349
Long-term	$ 738

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