CONSOLIDATED STATEMENTS of CHANGES in STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Impact of adoption of ASC 606, net of taxes	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Deficit Impact of adoption of ASC 606, net of taxes	Treasury Stock, at cost
Number of shares outstanding, beginning balance (shares) at Sep. 30, 2018			10,248,905
Beginning Balance at Sep. 30, 2018	$ 25,376	$ 441	$ 102	$ 47,326	$ (20,463)	$ 441	$ (1,589)
Net Income (Loss) Attributable to Parent	4,747				4,747
Vested restricted stock and restricted stock units, net of shares withheld for payment of taxes (shares)			51,872
Vested restricted stock and restricted stock units, net of shares withheld for payment of taxes	(52)		$ 1	(53)
Stock Issued, Value, Stock Options Exercised, Net of Tax Benefit (Expense)	$ 101			101
Exercise of stock options, net of shares surrendered (shares)	34,000		26,707
Stock Issued During Period, Value, Employee Stock Purchase Plan	$ 60			60
Employee stock plan purchases (shares)			11,064
Employee stock plan purchases	4,747
APIC, Share-based Payment Arrangement, Option, Increase for Cost Recognition	567			567
Ending Balance at Sep. 30, 2019	$ 31,240		$ 103	48,001	(15,275)		(1,589)
Number of shares outstanding, ending balance (shares) at Sep. 30, 2019	10,338,548		10,338,548
Net Income (Loss) Attributable to Parent	$ 6,753				6,753
Stock-based compensation	739			739
Vested restricted stock and restricted stock units, net of shares withheld for payment of taxes (shares)			46,695
Vested restricted stock and restricted stock units, net of shares withheld for payment of taxes	$ (98)		$ 0	(98)
Exercise of stock options, net of shares surrendered (shares)	100,500		100,500
Exercise of stock options, net of shares surrendered	$ 434		$ 1	433
Employee stock plan purchases (shares)			14,983
Employee stock plan purchases	87		$ 1	86
Ending Balance at Sep. 30, 2020	$ 39,155		$ 105	$ 49,161	$ (8,522)		$ (1,589)
Number of shares outstanding, ending balance (shares) at Sep. 30, 2020	10,500,726		10,500,726