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Financing receivables, net - Portfolio of risk rating (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023
Financing receivables, net:
Financing receivables, gross	$ 5,714	$ 8,027
Unearned interest income	(560)	(684)
Allowance for credit losses	(35)	(37)	$ (77)	$ 0
Financing receivables, net	5,119	7,306
Short-term	2,478	4,384
Long-term	2,641	2,922
Low Risk Rating
Financing receivables, net:
Financing receivables, gross	4,794	7,153
Unearned interest income	(480)	(599)
Allowance for credit losses	(21)	(27)	(16)	0
Financing receivables, net	4,293	6,527
Short-term	2,017	4,013
Long-term	2,276	2,514
Moderate Risk Rating
Financing receivables, net:
Financing receivables, gross	780	874
Unearned interest income	(66)	(85)
Allowance for credit losses	(8)	(10)	(61)	0
Financing receivables, net	706	779
Short-term	424	371
Long-term	282	408
High Risk Rating
Financing receivables, net:
Financing receivables, gross	140	0
Unearned interest income	(14)	0
Allowance for credit losses	(6)	0	$ 0	$ 0
Financing receivables, net	120	0
Short-term	37	0
Long-term	$ 83	$ 0

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