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Earnings Per Share of Common Stock - Basic and diluted earnings per share computations (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Earnings Per Share [Abstract]        
Net income (loss) $ (210) $ 532 $ (1,482) $ (37)
Less: net income attributable to nonvested common stock   23    
Net income (loss) attributable to common stockholders $ (210) $ 509 $ (1,482) $ (37)
Weighted average total shares outstanding – basic 4,048 4,244 4,015 3,913
Less: weighted average non-vested shares outstanding   193    
Weighted average number of common shares outstanding – basic 4,048 4,051 4,015 3,913
Potential common shares from non-vested stock awards and the assumed exercise of stock options   91    
Weighted average common shares outstanding – diluted 4,048 4,142 4,015 3,913
Net income (loss) per share – basic $ (0.05) $ 0.13 $ (0.37) $ (0.01)
Net income (loss) per share – diluted $ (0.05) $ 0.12 $ (0.37) $ (0.01)