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 (Loss) [Member]	Retained Earnings [Member]
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 (loss) income	7,813				7,813
Other comprehensive income (loss), net of tax	57			57
Issuance of common stock	296	$ 4	292
Issuance of common stock ,shares		89
Common stock options exercised, net	2,240	$ 6	2,234
Common stock option exercise ,shares		125
Purchase of common stock to pay employee taxes	(2,242)	$ (1)	(2,241)
Purchase of common stock to pay employee taxes ,shares		(18)
Stock-based compensation	2,862		2,862
Ending balance at Mar. 31, 2021	142,081	$ 693	18,516	3,231	119,641
Ending balance ,shares at Mar. 31, 2021		13,868
Beginning balance at Dec. 31, 2020	133,407	$ 687	16,160	5,006	111,554
Beginning balance, shares at Dec. 31, 2020		13,739
Net (loss) income	8,087				8,087
Other comprehensive income (loss), net of tax	(1,775)			(1,775)
Issuance of common stock	296		296
Issuance of common stock ,shares		8
Common stock options exercised, net	2,234	$ 6	2,228
Common stock option exercise ,shares		122
Purchase of common stock to pay employee taxes	(1,597)		(1,597)
Purchase of common stock to pay employee taxes ,shares		(1)
Stock-based compensation	1,429		1,429
Ending balance at Mar. 31, 2021	142,081	$ 693	18,516	3,231	119,641
Ending balance ,shares at Mar. 31, 2021		13,868
Beginning balance at Sep. 30, 2021	140,085	$ 695	21,598	1,727	116,065
Beginning balance, shares at Sep. 30, 2021		13,899
Net (loss) income	(6,895)				(6,895)
Other comprehensive income (loss), net of tax	(3,161)			(3,161)
Issuance of common stock	372	$ 5	367
Issuance of common stock ,shares		91
Common stock options exercised, net	369	$ 1	368
Common stock option exercise ,shares		20
Purchase of common stock to pay employee taxes	(906)	$ (1)	(905)
Purchase of common stock to pay employee taxes ,shares		(20)
Stock-based compensation	3,399		3,399
Ending balance at Mar. 31, 2022	133,263	$ 700	24,827	(1,434)	109,170
Ending balance ,shares at Mar. 31, 2022		13,990
Beginning balance at Dec. 31, 2021	136,671	$ 699	22,644	75	113,253
Beginning balance, shares at Dec. 31, 2021		13,975
Net (loss) income	(4,083)				(4,083)
Other comprehensive income (loss), net of tax	(1,509)			(1,509)
Issuance of common stock	372	$ 1	371
Issuance of common stock ,shares		10
Common stock options exercised, net	139		139
Common stock option exercise ,shares		6
Purchase of common stock to pay employee taxes	(46)		(46)
Purchase of common stock to pay employee taxes ,shares		(1)
Stock-based compensation	1,719		1,719
Ending balance at Mar. 31, 2022	$ 133,263	$ 700	$ 24,827	$ (1,434)	$ 109,170
Ending balance ,shares at Mar. 31, 2022		13,990