Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation and Summary of Significant Accounting Policies - Earnings (Loss) Per Share (Details)

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Basis of Presentation and Summary of Significant Accounting Policies - Earnings (Loss) Per Share (Details) - shares
3 Months Ended 6 Months Ended 9 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Summary of computation of basic and diluted net income (loss) per share            
Weighted average shares outstanding (shares) 16,055,000 19,558,000 16,292,000 20,000,000    
Dilutive potential common shares:            
Restricted stock (in shares) 40,000 0 0 38,000    
Stock options (in shares) 599,000 0 0 761,000    
Shares used to compute diluted income per share (shares) 16,694,000 19,558,000 16,292,000 20,799,000 16,292,000 20,799,000
Potentially dilutive shares excluded from calculation due to anti-dilutive effect (shares) 7,832,000 7,457,000 8,988,000 7,243,000