CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income	Treasury Stock
Balance (in shares) at Sep. 30, 2013		9,842,602
Balance at Sep. 30, 2013	$ 137,876	$ 98	$ 15,126	$ 122,458	$ 201	$ (7)
Increase (Decrease) in Stockholders' Equity
Net income	15,889			15,889
Other comprehensive loss	(122)				(122)
Issuances of common stock (in shares)		13,770
Issuances of common stock	211	$ 0	211
Tax benefit from stock option exercises (in shares)		0
Tax benefit from stock option exercises	$ 51	$ 0	51
Equity compensation payments (in shares)	31,788	31,788
Equity compensation payments	$ 775	$ 1	774
Purchases of common stock for treasury	(5,067)					(5,067)
Retirement of common stock in treasury (in shares)		(210,141)
Retirement of common stock in treasury		$ (2)	(5,050)			5,052
Balance (in shares) at Sep. 30, 2014		9,678,019
Balance at Sep. 30, 2014	149,613	$ 97	11,112	138,347	79	(22)
Increase (Decrease) in Stockholders' Equity
Net income	15,271			15,271
Other comprehensive loss	(458)				(458)
Issuances of common stock (in shares)		36,791
Issuances of common stock	552		552
Tax benefit from stock option exercises	$ 84		84
Equity compensation payments (in shares)	24,827	24,827
Equity compensation payments	$ 504	$ 0	504
Purchases of common stock for treasury	(5,319)					(5,319)
Retirement of common stock in treasury (in shares)		(249,763)
Retirement of common stock in treasury		$ (2)	(5,291)			5,293
Balance (in shares) at Sep. 30, 2015		9,489,874
Balance at Sep. 30, 2015	160,247	$ 95	6,961	153,618	(379)	(48)
Increase (Decrease) in Stockholders' Equity
Net income	18,658			18,658
Other comprehensive loss	(51)				(51)
Issuances of common stock (in shares)		3,343
Issuances of common stock	$ 81		81
Equity compensation payments (in shares)	22,664	22,664
Equity compensation payments	$ 556		556
Purchases of common stock for treasury	(7,501)					(7,501)
Retirement of common stock in treasury (in shares)		(312,091)
Retirement of common stock in treasury		$ (3)	(7,546)			7,549
Balance (in shares) at Sep. 30, 2016		9,203,790
Balance at Sep. 30, 2016	$ 171,990	$ 92	$ 52	$ 172,276	$ (430)	$ 0