CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income	Treasury Stock	Total
Balance at Sep. 30, 2012	$ 98	$ 15,400	$ 115,235	$ 338	$ (15)	$ 131,056
Balance (in shares) at Sep. 30, 2012	9,840,045
Increase (Decrease) in Stockholders' Equity
Net income			17,008			17,008
Other comprehensive loss				(137)		(137)
Issuances of common stock	$ 2	2,389				2,391
Issuances of common stock (in shares)	187,177
Tax benefit from stock option exercises		453				453
Dividends paid on common stock			(9,785)			(9,785)
Purchases of common stock for treasury					(3,110)	(3,110)
Retirement of common stock in treasury	$ (2)	(3,116)			3,118
Retirement of common stock in treasury (in shares)	(184,620)
Balance at Sep. 30, 2013	$ 98	15,126	122,458	201	(7)	137,876
Balance (in shares) at Sep. 30, 2013	9,842,602
Increase (Decrease) in Stockholders' Equity
Net income			15,889			15,889
Other comprehensive loss				(122)		(122)
Issuances of common stock		211				211
Issuances of common stock (in shares)	13,770
Equity compensation payments	$ 1	774				775
Equity compensation payments (in shares)	31,788
Tax benefit from stock option exercises		51				51
Purchases of common stock for treasury					(5,067)	(5,067)
Retirement of common stock in treasury	$ (2)	(5,050)			5,052
Retirement of common stock in treasury (in shares)	(210,141)
Balance at Sep. 30, 2014	$ 97	11,112	138,347	79	(22)	149,613
Balance (in shares) at Sep. 30, 2014	9,678,019
Increase (Decrease) in Stockholders' Equity
Net income			15,271			15,271
Other comprehensive loss				(458)		(458)
Issuances of common stock		552				552
Issuances of common stock (in shares)	36,791
Equity compensation payments		504				504
Equity compensation payments (in shares)	24,827
Tax benefit from stock option exercises		84				84
Purchases of common stock for treasury					(5,319)	(5,319)
Retirement of common stock in treasury	$ (2)	(5,291)			5,293
Retirement of common stock in treasury (in shares)	(249,763)
Balance at Sep. 30, 2015	$ 95	$ 6,961	$ 153,618	$ (379)	$ (48)	$ 160,247
Balance (in shares) at Sep. 30, 2015	9,489,874