Summarized Quarterly Results (unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Summarized quarterly results of operations
Net sales	$ 35,889	$ 28,717	$ 24,615	$ 20,080	$ 32,959	$ 30,999	$ 29,044	$ 26,652	$ 109,301	$ 119,654	$ 116,001
Gross profit	4,065	4,967	3,701	2,999	6,747	7,022	6,150	5,410	15,732	25,329	27,358
Income (loss) from continuing operations	(366)	(1,007)	(863)	(1,345)	955	1,983	1,511	1,154	(3,581)	5,603	9,758
Income (loss) from discontinued operations, net of tax	(27)	0	799	(63)	(212)	(76)	(85)	(207)	709	(580)	476
Net income (loss)	$ (393)	$ (1,007)	$ (64)	$ (1,408)	$ 743	$ 1,907	$ 1,426	$ 947	$ (2,872)	$ 5,023	$ 10,234
Income (loss) per share from continuing operations:
Continuing operations (in dollars per share)	$ (0.06)	$ (0.19)	$ (0.16)	$ (0.25)	$ 0.17	$ 0.37	$ 0.28	$ 0.22	$ (0.66)	$ 1.04	$ 1.82
Diluted (in dollars per share)	(0.06)	(0.19)	(0.16)	(0.25)	0.17	0.37	0.28	0.21	(0.66)	1.03	1.81
Income (loss) per share from discontinued operations, net of tax:
Basic (in dollars per share)	(0.01)	0.00	0.15	(0.01)	(0.04)	(0.01)	(0.02)	(0.04)	0.13	(0.11)	0.09
Diluted (in dollars per share)	(0.01)	0.00	0.15	(0.01)	(0.04)	(0.01)	(0.02)	(0.04)	0.13	(0.11)	0.09
Net income (loss) per share
Basic (in dollars per share)	(0.07)	(0.19)	(0.01)	(0.26)	0.13	0.36	0.26	0.18	(0.53)	0.93	1.91
Diluted (in dollars per share)	$ (0.07)	$ (0.19)	$ (0.01)	$ (0.26)	$ 0.13	$ 0.36	$ 0.26	$ 0.17	$ (0.53)	$ 0.92	$ 1.90
Income (loss) before income tax provision (benefit)									$ (6,025)	$ 8,356	$ 13,846
Income tax (benefit) provision									$ (2,444)	$ 2,753	$ 4,088
Scenario, Previously Reported
Summarized quarterly results of operations
Gross profit					$ 6,894	$ 7,157	$ 6,304	$ 5,570
Cost of Sales
Net income (loss) per share
Immaterial correction increase (decrease), percent	(1.20%)	0.40%	3.60%	0.50%
Selling, General and Administrative Expenses
Net income (loss) per share
Immaterial correction increase (decrease), percent	(3.20%)	(3.40%)	(4.30%)	5.30%