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	2,572				2,572
Other comprehensive income (loss), net of tax	(1,274)			(1,274)
Issuance of common stock	209	$ 6	203
Issuance of common stock, shares		134
Common stock options exercised, net	55		55
Common stock options exercised, net, shares		2
Purchase of common stock to pay employee taxes	(2,547)	$ (2)	(2,545)
Purchase of common stock to pay employee taxes, shares		(45)
Stock-based compensation	2,190		2,190
Ending balance at Mar. 31, 2019	115,313	$ 674	7,510	1,444	105,685
Ending balance, shares at Mar. 31, 2019		13,489
Beginning balance at Dec. 31, 2018	113,621	$ 674	6,340	2,184	104,423
Beginning balance, shares at Dec. 31, 2018		13,483
Net income	1,262				1,262
Other comprehensive income (loss), net of tax	(740)			(740)
Issuance of common stock	209		209
Issuance of common stock, shares		6
Common stock options exercised, net	19		19
Common stock options exercised, net, shares		1
Purchase of common stock to pay employee taxes	(17)		(17)
Purchase of common stock to pay employee taxes, shares		(1)
Stock-based compensation	959		959
Ending balance at Mar. 31, 2019	115,313	$ 674	7,510	1,444	105,685
Ending balance, shares at Mar. 31, 2019		13,489
Beginning balance at Sep. 30, 2019	122,516	$ 675	10,740	396	110,705
Beginning balance, shares at Sep. 30, 2019		13,504
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, 2019	122,516	$ 675	10,740	396	110,705
Beginning balance, shares at Sep. 30, 2019		13,504
Net income	1,610				1,610
Other comprehensive income (loss), net of tax	94			94
Issuance of common stock	218	$ 7	211
Issuance of common stock, shares		130
Common stock options exercised, net	100		100
Common stock options exercised, net, shares		20
Purchase of common stock to pay employee taxes	(2,269)	$ (2)	(2,267)
Purchase of common stock to pay employee taxes, shares		(45)
Stock-based compensation	2,697		2,697
Ending balance at Mar. 31, 2020	124,966	$ 680	11,481	490	112,315
Ending balance, shares at Mar. 31, 2020		13,609
Beginning balance at Dec. 31, 2019	123,326	$ 680	10,361	1,432	110,853
Beginning balance, shares at Dec. 31, 2019		13,593
Net income	1,462				1,462
Other comprehensive income (loss), net of tax	(942)			(942)
Issuance of common stock	218		218
Issuance of common stock, shares		5
Common stock options exercised, net	9		9
Common stock options exercised, net, shares		12
Purchase of common stock to pay employee taxes	(411)		(411)
Purchase of common stock to pay employee taxes, shares		(1)
Stock-based compensation	1,304		1,304
Ending balance at Mar. 31, 2020	$ 124,966	$ 680	$ 11,481	$ 490	$ 112,315
Ending balance, shares at Mar. 31, 2020		13,609