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, 2019	$ 122,516	$ 675	$ 10,740	$ 396	$ 110,705
Beginning balance, shares at Sep. 30, 2019		13,504
Net income (loss)	148				148
Other comprehensive income, 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
Beginning balance at Sep. 30, 2020	131,055	$ 684	15,369	3,174	111,828
Beginning balance, shares at Sep. 30, 2020		13,672
Net income (loss)	(274)				(274)
Other comprehensive income, net of tax	1,832			1,832
Issuance of common stock		$ 4	(4)
Issuance of common stock, shares		81
Common stock options exercised, net	6		6
Common stock options exercised, net, shares		3
Purchase of common stock to pay employee taxes	(645)	$ (1)	(644)
Purchase of common stock to pay employee taxes, shares		(17)
Stock-based compensation	1,433		1,433
Ending balance at Dec. 31, 2020	$ 133,407	$ 687	$ 16,160	$ 5,006	$ 111,554
Ending balance, shares at Dec. 31, 2020		13,739