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, 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	5,498				5,498
Net 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		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
Beginning balance at Sep. 30, 2019	122,516	$ 675	10,740	396	110,705
Beginning balance, shares at Sep. 30, 2019		13,504
Net income	148				148
Other comprehensive income (loss), net of tax	1,036			1,036
Issuance of common stock		$ 7	(7)
Issuance of common stock, shares		125
Common stock options exercised, net	91		91
Common stock options exercised, net, shares		8
Purchase of common stock to pay employee taxes	(1,858)	$ (2)	(1,856)
Purchase of common stock to pay employee taxes, shares		(44)
Stock-based compensation	1,393		1,393
Ending balance at Dec. 31, 2019	$ 123,326	$ 680	$ 10,361	$ 1,432	$ 110,853
Ending balance, shares at Dec. 31, 2019		13,593