Equity and Stock-Based Compensation - Summary of Stock Option Activity (Details) - $ / shares	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Options
Outstanding at end of period	608,269
Stock Options
Options
Outstanding at beginning of period	696,665	1,068,665	1,248,758
Granted	204,000	32,500	198,850
Exercised	(241,320)	(160,375)	(52,201)
Forfeited/expired	(51,076)	(244,125)	(326,742)
Outstanding at end of period	608,269	696,665	1,068,665
Exercisable at end of period	403,853	611,542	842,083
Weighted average grant-date fair value of options granted during the period	$ 3.33	$ 2.89	$ 3.08
Weighted Average Exercise Price
Outstanding at beginning of period	7.00	7.04	7.69
Granted	6.25	5.34	5.35
Exercised	6.40	5.47	4.02
Forfeited/expired	13.01	7.94	9.00
Outstanding at end of period	6.48	7.00	7.04
Exercisable at end of period	$ 6.87	$ 7.19	$ 7.45