Consolidated Statement of Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income [Member]	Retained Earnings [Member]
Beginning balance at Sep. 30, 2016	$ 106,833	$ 660	$ 6,754	$ 1,273	$ 98,146
Beginning balance, shares at Sep. 30, 2016		13,208,000
Net income (loss)	3,926				3,926
Other comprehensive income (loss), net of tax	2,144			2,144
Issuance of common stock	348	$ 5	343
Issuance of common stock, shares		99,000
Common stock options exercised, net	$ 96	$ 1	95
Common stock options exercised, net, shares	6,819	7,000
Stock Repurchased During Period Value	$ (4,702)	$ (10)	(4,692)
Common stock repurchased, shares	(196,190)	(196,000)
Purchase of common stock to pay employee taxes	$ (560)	$ (1)	(559)
Purchase of common stock to pay employee taxes, shares		(23,000)
Stock-based compensation	3,472		3,472
Ending balance at Sep. 30, 2017	111,557	$ 655	5,413	3,417	102,072
Ending balance, shares at Sep. 30, 2017		13,095,000
Net income (loss)	(4,457)				(4,457)
Other comprehensive income (loss), net of tax	(699)			(699)
Issuance of common stock	340	$ 7	333
Issuance of common stock, shares		137,000
Common stock options exercised, net	$ 1,749	$ 22	1,727
Common stock options exercised, net, shares	450,495	440,000
Purchase of common stock to pay employee taxes	$ (4,687)	$ (14)	(4,673)
Purchase of common stock to pay employee taxes, shares		(274,000)
Stock-based compensation	4,807		4,807
Ending balance at Sep. 30, 2018	108,610	$ 670	7,607	2,718	97,615
Ending balance, shares at Sep. 30, 2018		13,398,000
Net impact from adoption of ASC Topic 606 (Note 2)	5,498				5,498
Net income (loss)	7,592				7,592
Other comprehensive income (loss), net of tax	(2,322)			(2,322)
Issuance of common stock	441	$ 7	434
Issuance of common stock, shares		141,000
Common stock options exercised, net	$ 282	$ 1	281
Common stock options exercised, net, shares	12,604	12,000
Purchase of common stock to pay employee taxes	$ (2,662)	$ (3)	(2,659)
Purchase of common stock to pay employee taxes, shares		(47,000)
Stock-based compensation	5,077		5,077
Ending balance at Sep. 30, 2019	$ 122,516	$ 675	$ 10,740	$ 396	$ 110,705
Ending balance, shares at Sep. 30, 2019		13,504,000