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		6 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share of Common Stock
Net (loss) income	$ (847)	$ (732)	$ 304	$ (1,272)
Less: net income (loss) attributable to nonvested common stock			15
Net income (loss) attributable to common stockholders	$ (847)	$ (732)	$ 289	$ (1,272)
Weighted average total shares outstanding – basic	4,158	4,036	4,326	3,999
Less: weighted average non–vested shares outstanding			209
Weighted average number of common shares outstanding – basic	4,158	4,036	4,117	3,999
Potential common shares from non–vested stock awards and the assumed exercise of stock options			85
Weighted average common shares outstanding – diluted	4,158	4,036	4,202	3,999
Net (loss) income per share – basic	$ (0.20)	$ (0.18)	$ 0.07	$ (0.32)
Net (loss) income per share – diluted	$ (0.20)	$ (0.18)	$ 0.07	$ (0.32)