Share-Based Compensation - Fair Value assumptions for stock option plan (Details) - USD ($)	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Share-Based Compensation
Share-based compensation expense	$ 1,336,000	$ 345,000	$ 341,000
2019 Plan | Employee and Non Employee Stock Option
Share-Based Compensation
Share-based compensation expense	756,000	$ 164,000	$ 181,000
Unrecognized compensation cost, related to non-vested stock options	$ 205,000
2019 Plan | Employee and Non Employee Stock Option | Minimum
Share-Based Compensation
Vesting period	3 years
2019 Plan | Employee and Non Employee Stock Option | Maximum
Share-Based Compensation
Expiration term	10 years
Vesting period	5 years