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
	Dec. 31, 2020	Dec. 31, 2019
Earnings Per Share of Common Stock
Net income (loss)	$ 1,151	$ (540)
Less: net income (loss) attributable to nonvested common stock	54
Net loss attributable to common stockholders	$ 1,097	$ (540)
Weighted average total shares outstanding – basic	4,277	3,963
Less: weighted average non-vested shares outstanding	203
Weighted average number of common shares outstanding – basic	4,074	3,963
Potential common shares from non-vested stock awards and the assumed exercise of stock options	98
Weighted average common shares outstanding – diluted	4,172	3,963
Net income (loss) per share – basic	$ 0.27	$ (0.14)
Net income (loss) per share – diluted	$ 0.26	$ (0.14)