Consolidated Statements of Changes in Stockholders' Equity (USD $) In Thousands, unless otherwise specified	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income(Loss)
Balances at Jun. 30, 2010	$ 177,585	$ 279	$ 111,637	$ 81,252	$ (16,078)	$ 495
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	18,982			18,982
Other comprehensive income (loss)	941					941
Exercise of stock options (97,840; 26,500 and 32,000 shares in 2013, 2012 and 2011 respectively)	166		83	(3)	86
Tax effect of exercised stock options and vesting of deferred shares	(109)		(109)
Issuance of deferred shares (367,449; 184,149 and 126,428 shares in 2013, 2012 and 2011 respectively)			(328)		328
Employee Stock Purchase Plan (4,452; 4,395 and 699 shares in 2013, 2012 and 2011 respectively)	10		8		2
Other treasury share purchases (107,344; 52,992 and 30,154 shares in 2013, 2012 and 2011 respectively)	(299)				(299)
Stock-based compensation expense	2,395		2,395
Balances at Jun. 30, 2011	199,671	279	113,686	100,231	(15,961)	1,436
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	17,188			17,188
Other comprehensive income (loss)	(665)					(665)
Exercise of stock options (97,840; 26,500 and 32,000 shares in 2013, 2012 and 2011 respectively)	167		98	0	69
Tax effect of exercised stock options and vesting of deferred shares	(152)		(152)
Issuance of deferred shares (367,449; 184,149 and 126,428 shares in 2013, 2012 and 2011 respectively)			(479)		479
Employee Stock Purchase Plan (4,452; 4,395 and 699 shares in 2013, 2012 and 2011 respectively)	47		36		11
Open market purchase of treasury shares (886,503 shares in 2012)	(8,126)				(8,126)
Other treasury share purchases (107,344; 52,992 and 30,154 shares in 2013, 2012 and 2011 respectively)	(537)				(537)
Stock-based compensation expense	3,504		3,504
Balances at Jun. 30, 2012	211,097	279	116,693	117,419	(24,065)	771
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	24,008			24,008
Other comprehensive income (loss)	(544)					(544)
Exercise of stock options (97,840; 26,500 and 32,000 shares in 2013, 2012 and 2011 respectively)	875		(662)		1,537
Tax effect of exercised stock options and vesting of deferred shares	3		3
Issuance of deferred shares (367,449; 184,149 and 126,428 shares in 2013, 2012 and 2011 respectively)			(1,667)		1,667
Employee Stock Purchase Plan (4,452; 4,395 and 699 shares in 2013, 2012 and 2011 respectively)	54		(8)		62
Other treasury share purchases (107,344; 52,992 and 30,154 shares in 2013, 2012 and 2011 respectively)	(1,162)				(1,162)
Stock-based compensation expense	3,831		3,831
Balances at Jun. 30, 2013	$ 238,162	$ 279	$ 118,190	$ 141,427	$ (21,961)	$ 227