Consolidated Statement Of Shareholders' Equity (USD $) In Thousands, except Share data	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings (Deficit) [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Total
Balance at Dec. 31, 2011	$ 301	$ 135,003	$ (1,037)	$ (6)	$ (12,723)	$ 121,538
Balance, shares at Dec. 31, 2011	30,067,000				(2,265,000)
Net income			7,946			7,946
Other comprehensive income (loss)				(33)		(33)
Comprehensive income						7,913
Cash dividends paid			(1,373)			(1,373)
Equity compensation		2,410			966	3,376
Equity compensation, shares	37,000				229,000
Exercise of options		37				37
Exercise of options, shares	8,000					48,000
Employee stock purchase plan	1	292				293
Employee stock purchase plan, shares	72,000					72,000
Excess tax (shortfall) benefit		(143)				(143)
Repurchase of common stock					(3,310)	(3,310)
Repurchase of common stock, shares					(639,000)
Redemption and repurchase of stock to cover tax withholdings		(66)			(153)	(219)
Redemption and repurchase of stock to cover tax withholdings, shares	(11,000)				(26,000)
Shares retired	(27)	(15,119)			15,146
Shares retired, shares	(2,687,000)				2,687,000
Balance at Dec. 31, 2012	275	122,414	5,536	(39)	(74)	128,112
Balance, shares at Dec. 31, 2012	27,486,000				(14,000)
Net income			16,172			16,172
Other comprehensive income (loss)				46		46
Comprehensive income						16,218
Cash dividends paid			(2,967)			(2,967)
Equity compensation	3	3,465				3,468
Equity compensation, shares	352,000
Exercise of options	4	2,728			(1,000)	1,732
Exercise of options, shares	365,000				(102,000)	365,000
Employee stock purchase plan	1	474				475
Employee stock purchase plan, shares	97,000					97,000
Excess tax (shortfall) benefit		(87)				(87)
Repurchase of common stock					(1,523)	(1,523)
Repurchase of common stock, shares					(253,000)
Redemption and repurchase of stock to cover tax withholdings	(1)	(409)			(271)	(681)
Redemption and repurchase of stock to cover tax withholdings, shares	(56,000)				(44,000)
Balance at Dec. 31, 2013	282	128,585	18,741	7	(2,868)	144,747
Balance, shares at Dec. 31, 2013	28,244,000				(413,000)
Net income			7,322			7,322
Other comprehensive income (loss)				(128)		(128)
Comprehensive income						7,194
Cash dividends paid			(3,295)			(3,295)
Equity compensation	6	3,691				3,697
Equity compensation, shares	642,000
Exercise of options	3	2,150			(191)	1,962
Exercise of options, shares	297,000				(18,000)	297,000
Employee stock purchase plan	1	712				713
Employee stock purchase plan, shares	111,000					111,000
Excess tax (shortfall) benefit		738				738
Repurchase of common stock					(5,588)	(5,588)
Repurchase of common stock, shares					(585,000)
Redemption and repurchase of stock to cover tax withholdings		(649)			(834)	(1,483)
Redemption and repurchase of stock to cover tax withholdings, shares	(65,000)				(85,000)
Balance at Dec. 31, 2014	$ 292	$ 135,227	$ 22,768	$ (121)	$ (9,481)	$ 148,685
Balance, shares at Dec. 31, 2014	29,229,000				(1,101,000)