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, 2015	$ 91,873	$ 647	$ 3,060	$ 5	$ 88,161
Beginning balance, shares at Sep. 30, 2015		12,945,000
Net (loss) income	9,985				9,985
Other comprehensive income (loss), net of tax	1,268			1,268
Issuance of common stock	270	$ 4	266
Issuance of common stock, shares		74,000
Common stock options exercised, net	$ 1,546	$ 10	1,536
Common stock options exercised, net, shares	437,850	196,000
Purchase of common stock to pay employee taxes	$ (1,953)	$ (1)	(1,952)
Purchase of common stock to pay employee taxes, shares		(7,000)
Stock-based compensation	3,844		3,844
Ending balance at Sep. 30, 2016	106,833	$ 660	6,754	1,273	98,146
Ending balance, shares at Sep. 30, 2016		13,208,000
Net (loss) income	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 (loss) income	(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