Summary of Significant Accounting Policies - Net Income (Loss) per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Net (loss) income	$ (2,668)	$ 254	$ (2,720)	$ 1,756
Weighted-average common shares outstanding (basic) (in shares)	5,840,000	5,779,000	5,827,000	5,753,000
Effect of dilutive securities:
Weighted-average common shares outstanding (diluted) (in shares)	5,840,000	6,006,000	5,827,000	5,960,000
Net (loss) income per share
Net (loss) income per share – basic (in dollars per share)	$ (0.46)	$ 0.04	$ (0.47)	$ 0.31
Net (loss) income per share – diluted (in dollars per share)	$ (0.46)	$ 0.04	$ (0.47)	$ 0.29
Anti-dilutive weighted-average common shares excluded from calculation of diluted earnings per share (in shares)	313,000	184,000	309,000	206,000
Restricted shares
Effect of dilutive securities:
Restricted and performance shares (in shares)	0	146,000	0	145,000
Performance shares
Effect of dilutive securities:
Restricted and performance shares (in shares)	0	81,000	0	62,000