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, 2012	$ 94,988	$ 733	$ 18,346	$ 40	$ 75,869
Beginning balance, shares at Sep. 30, 2012		14,657,000
Net income	15,167				15,167
Other comprehensive income, net of tax	18			18
Issuance of common stock	275	$ 1	274
Issuance of common stock, shares		20,000
Common stock repurchased	$ (18,809)	$ (40)	(18,769)
Common stock repurchased, shares	(795,643)	(796,000)
Common stock options exercised, net	$ 144	$ 1	143
Common stock options exercised, net, shares	10,273	10,000
Purchase of common stock to pay employee taxes	$ (41)		(41)
Reduction or excess tax benefit from stock-based compensation plans	(477)		(477)
Stock-based compensation	2,552		2,552
Ending balance at Sep. 30, 2013	93,817	$ 695	2,028	58	91,036
Ending balance, shares at Sep. 30, 2013		13,891,000
Net income	12,031				12,031
Other comprehensive income, net of tax	1,470			1,470
Issuance of common stock	269	$ 8	261
Issuance of common stock, shares		163,000
Common stock repurchased	$ (11,541)	$ (25)	(2,330)		(9,186)
Common stock repurchased, shares	(485,777)	(485,000)
Common stock options exercised, net	$ 243	$ 2	241
Common stock options exercised, net, shares	190,434	38,000
Purchase of common stock to pay employee taxes	$ (1,111)		(1,111)
Reduction or excess tax benefit from stock-based compensation plans	236		236
Stock-based compensation	3,337		3,337
Ending balance at Sep. 30, 2014	98,751	$ 680	2,662	1,528	93,881
Ending balance, shares at Sep. 30, 2014		13,607,000
Net income	11,947				11,947
Other comprehensive income, net of tax	(1,523)			(1,523)
Issuance of common stock	279	$ 7	272
Issuance of common stock, shares		139,000
Common stock repurchased	(20,000)	$ (42)	(2,485)		(17,473)
Common stock repurchased, shares		(848,000)
Common stock options exercised, net	$ 431	$ 2	429
Common stock options exercised, net, shares	166,422	47,000
Purchase of common stock to pay employee taxes	$ (825)		(631)		(194)
Reduction or excess tax benefit from stock-based compensation plans	432		432
Stock-based compensation	2,381		2,381
Ending balance at Sep. 30, 2015	$ 91,873	$ 647	$ 3,060	$ 5	$ 88,161
Ending balance, shares at Sep. 30, 2015		12,945,000