Condensed Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income [Member]	Retained Earnings [Member]
Beginning balance at Sep. 30, 2017	$ 111,557	$ 655	$ 5,413	$ 3,417	$ 102,072
Beginning balance, shares at Sep. 30, 2017		13,095
Net (loss) income	(1,556)				(1,556)
Other comprehensive income (loss), net of tax	617			617
Issuance of common stock		$ 6	(6)
Issuance of common stock, shares		123
Common stock options exercised, net	155	$ 1	154
Common stock options exercised, net, shares		13
Purchase of common stock to pay employee taxes	(1,129)	$ (2)	(1,127)
Purchase of common stock to pay employee taxes, shares		(35)
Stock-based compensation	903		903
Ending balance at Dec. 31, 2017	110,547	$ 660	5,337	4,034	100,516
Ending balance, shares at Dec. 31, 2017		13,196
Beginning balance at Sep. 30, 2018	108,610	$ 670	7,607	2,718	97,615
Beginning balance, shares at Sep. 30, 2018		13,398
Net impact from adoption of ASC Topic 606 (Note 2)	5,498				5,498
Net (loss) income	1,310				1,310
Other comprehensive income (loss), net of tax	(534)			(534)
Issuance of common stock		$ 6	(6)
Issuance of common stock, shares		128
Common stock options exercised, net	36	$ 0	36
Common stock options exercised, net, shares		1
Purchase of common stock to pay employee taxes	(2,530)	$ (2)	(2,528)
Purchase of common stock to pay employee taxes, shares		(44)
Stock-based compensation	1,231		1,231
Ending balance at Dec. 31, 2018	$ 113,621	$ 674	$ 6,340	$ 2,184	$ 104,423
Ending balance, shares at Dec. 31, 2018		13,483