Stock-Based Compensation - Share-based Payment Arrangement, Option, Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Options (Shares)
Outstanding, beginning balance (in shares)	100,000
Stock options, granted (in shares)	0
Stock options, exercised (in shares)	(49,000)
Stock options, expired (in shares)	0
Stock options, forfeited (in shares)	(1,000)
Outstanding, ending balance (in shares)	50,000	100,000
Exercisable (in shares)	33,334
Weighted Average Exercise Price
Outstanding, weighted average exercise price, beginning balance (in dollars per share)	$ 1.55
Granted (in dollars per share)	0
Exercised (in dollars per share)	1.81
Expired (in dollars per share)	0
Forfeited (in dollars per share)	1.81
Outstanding, weighted average exercise price, ending balance (in dollars per share)	1.28	$ 1.55
Exercisable (in dollars per share)	$ 1.28
Aggregate Intrinsic Value
Aggregate intrinsic value, outstanding, beginning balance	$ 37
Aggregate intrinsic value, exercised	49	$ 304
Aggregate intrinsic value, forfeited	0
Aggregate intrinsic value, outstanding, ending balance	54	$ 37
Aggregate intrinsic value, exercisable	$ 36