Summary of Significant Accounting Policies - Recent Accounting Pronouncements (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Oct. 01, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cumulative effect of initial application		$ 158
Income Statement [Abstract]
Total sales	$ 79,061
Total cost of sales	61,035	54,517
Gross profit	18,026	18,399
Operating loss	(826)	(1,601)
Income tax benefit	(71)	882
Loss from continuing operations	(371)	(1,988)
Net (loss) income attributable to common stockholders	$ (371)	$ 13,842
Basic earnings per share (dollars per share)	$ (0.09)	$ 3.62
Diluted earnings per share (dollars per share)	$ (0.09)	$ 3.55
Assets:
Accounts receivable	$ 15,114	$ 11,980
Unbilled accounts receivable		1,166
Inventories	7,818	7,558
Other current assets	4,649	1,878
Deferred tax asset	1,946	1,895
Liabilities:
Deferred revenue	741
Shareholders' Equity:
Retained earnings	27,246	$ 29,926
Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cumulative effect of initial application			$ 158
Balances without adoption of ASC 606 | Accounting Standards Update 2014-09
Income Statement [Abstract]
Total sales	78,563
Total cost of sales	60,567
Gross profit	17,996
Operating loss	(856)
Income tax benefit	(76)
Loss from continuing operations	(396)
Net (loss) income attributable to common stockholders	$ (396)
Basic earnings per share (dollars per share)	$ (0.10)
Diluted earnings per share (dollars per share)	$ (0.10)
Assets:
Accounts receivable	$ 14,929
Unbilled accounts receivable	565
Inventories	8,484
Other current assets	4,069
Deferred tax asset	2,000
Liabilities:
Deferred revenue	1,444
Shareholders' Equity:
Retained earnings	27,063
Effect of change Higher/(Lower) | Accounting Standards Update 2014-09
Income Statement [Abstract]
Total sales	498
Total cost of sales	468
Gross profit	30
Operating loss	30
Income tax benefit	5
Loss from continuing operations	25
Net (loss) income attributable to common stockholders	$ 25
Basic earnings per share (dollars per share)	$ 0.01
Diluted earnings per share (dollars per share)	$ 0.01
Assets:
Accounts receivable	$ 185
Unbilled accounts receivable	(565)
Inventories	(666)
Other current assets	580
Deferred tax asset	(54)
Liabilities:
Deferred revenue	(703)
Shareholders' Equity:
Retained earnings	$ 183