Income tax reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Income Tax Disclosure [Abstract]
Federal rate	$ 752	$ 1,957	$ 179
State income tax (net of Federal income tax benefit)	196	320	38
Other, net	(33)	(124)	16
Provision for income taxes	$ 915	$ 2,153	$ 233