CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Cumulative-effect adjustment for adoption of ASC 842	Common Stock	Treasury Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Deficit Cumulative-effect adjustment for adoption of ASC 842
Beginning Balance (in shares) at Sep. 30, 2019			12,036,000	0
Beginning Balance at Sep. 30, 2019	$ 45,571	$ (2)	$ 12	$ 0	$ 85,114	$ (39,555)	$ (2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Expense related to director restricted stock unit (in shares)			90,000
Expense related to director restricted stock unit	87				87
Expense related to employee stock options	116				116
Exercise of stock options (in shares)			20,000
Exercise of stock options	27				27
Repurchases of common stock (in shares)				27,000
Repurchases of common stock	$ (111)
Cancellation of common stock (in shares)	(22,000)
Cancellation of common stock	$ (95)
Net income	1,551					1,551
Ending Balance (in shares) at Dec. 31, 2019			12,124,000	27,000
Ending Balance at Dec. 31, 2019	$ 47,144		$ 12	$ (111)	85,249	(38,006)
Beginning Balance (in shares) at Sep. 30, 2020	12,404,000		12,404,000	0
Beginning Balance at Sep. 30, 2020	$ 53,437		$ 12	$ 0	85,868	(32,443)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Expense related to director restricted stock unit (in shares)			78,000
Expense related to director restricted stock unit	116				116
Expense related to employee stock options	$ 342				342
Exercise of stock options (in shares)	62,000		62,000
Exercise of stock options	$ 226		$ 1		225
Net income	$ 1,814					1,814
Ending Balance (in shares) at Dec. 31, 2020	12,544,000		12,544,000	0
Ending Balance at Dec. 31, 2020	$ 55,935		$ 13	$ 0	$ 86,551	$ (30,629)