Stock-Based Compensation - Common Stock Awards (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Option Shares
Outstanding at beginning or year, (in shares)	146,606	140,706
Options granted (in shares)	8,000	23,000
Exercised (in shares)	(6,042)	(14,100)
Forfeited or expired (in shares)	(26,894)	(3,000)
Outstanding at end of year, (in shares)	121,670	146,606
Exercisable at end of year, (in shares)	67,370	57,712
Fully vested and expected to vest, (in shares)	121,670	146,606
Weighted Average Exercise Price
Weighted Average Exercise Price, Outstanding at beginning of year (usd per share)	$ 9.45	$ 8.67
Weighted Average Exercise Price, Granted (usd per share)	13.60	13.75
Weighted Average Exercise Price, Exercised (usd per share)	8.11	8.27
Weighted Average Exercise Price, Forfeited or expired (usd per share)	9.31	11.00
Weighted Average Exercise Price, Outstanding at ending of year (usd per share)	9.82	9.45
Weighted Average Exercise Price, Exercisable at end of year (usd per share)	8.38	7.70
Weighted Average Exercise Price, Fully vested and expected to vest (usd per share)	$ 9.82	$ 9.45
Weighted Average Remaining Contractual Term, Outstanding at end of year	5 years 5 months 23 days	6 years 8 months 5 days
Weighted Average Remaining Contractual Term, Exercisable at end of year	3 years 5 months 1 day	3 years 10 months 21 days
Options, exercisable, intrinsic value	$ 379	$ 361
Weighted Average Remaining Contractual Term, Fully vested and expected to vest	5 years 5 months 23 days	6 years 8 months 5 days
Options, vested and expected to vest, exercisable, aggregate intrinsic value	$ 508	$ 659