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Summary of Significant Accounting Policies - Net Income (Loss) per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2022
Mar. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Net (loss) income $ 3,639 $ (1,491) $ (52) $ 1,502
Weighted-average common shares outstanding (basic) (in shares) 5,840,000 5,777,000 5,819,000 5,735,000
Effect of dilutive securities:        
Weighted-average common shares outstanding (diluted) (in shares) 5,961,000 5,777,000 5,819,000 5,932,000
Net income per share        
Net income per share – basic (in dollars per share) $ 0.62 $ (0.26) $ (0.01) $ 0.26
Net income per share – diluted (in dollars per share) $ 0.61 $ (0.26) $ (0.01) $ 0.25
Anti-dilutive weighted-average common shares excluded from calculation of diluted earnings per share (in shares) 196,000 411,000 307,000 217,000
Restricted shares        
Effect of dilutive securities:        
Restricted and performance shares (in shares) 100,000 0 0 144,000
Performance shares        
Effect of dilutive securities:        
Restricted and performance shares (in shares) 21,000 0 0 53,000