Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Earnings Per Share [Abstract]
Net Income (Loss) Attributable to Parent	$ (5,142)	$ (3,215)	$ (829)	$ (300)	$ 5,508	$ 4,894	$ 5,567	$ (459)	$ (9,486)	$ 15,510	$ 9,439
Denominator:
Weighted average basic shares (in shares)									11,453	11,400	11,869
Dilutive effect of restricted stock units (in shares)									0	31	39
Weighted average diluted shares with assumed conversions									11,453	11,431	11,908
Net earnings (loss) per share:
Basic earnings (loss) per share (in dollars per share)	$ (0.45)	$ (0.28)	$ (0.07)	$ (0.03)	$ 0.48	$ 0.43	$ 0.49	$ (0.04)	$ (0.83)	$ 1.36	$ 0.80
Diluted earnings (loss) per share (in dollars per share)	$ (0.45)	$ (0.28)	$ (0.07)	$ (0.03)	$ 0.48	$ 0.43	$ 0.49	$ (0.04)	$ (0.83)	$ 1.36	$ 0.79