CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY AND COMPREHENSIVE INCOME (LOSS) (USD $) In Thousands, except Share data	Total	Common Stock [Member]	Capital in Excess of Par Value [Member]	Accumulated Other Comprehensive Loss [Member]	Retained Earnings [Member]
Balance at Dec. 31, 2009	$ 94,096	$ 992	$ 52,580	$ (20,505)	$ 61,029
Balance (in shares) at Dec. 31, 2009		9,923,000
Comprehensive income:
Net income	8,714	0	0	0	8,714
Other comprehensive income, net of tax:
Changes in unrealized loss on derivative instruments	(5)	0	0	(5)	0
Comprehensive income	8,709
Issuance of common stock through stock plan transactions	1,090	12	1,078	0	0
Issuance of common stock through stock plan transactions (in shares)		124,000
Issuance of restricted stock	0	3	(3)	0	0
Issuance of restricted stock (in shares)		28,000
Forfeiture of restricted stock	0	(1)	1	0	0
Forfeiture of restricted stock (in shares)		(16,000)
Release of restricted stock	(211)	(2)	(209)	0	0
Release of restricted stock (in shares)		(19,000)
Share-based compensation	553	0	553	0	0
Tax benefit from stock plan transactions	160	0	160	0	0
Balance at Sep. 30, 2010	104,397	1,004	54,160	(20,510)	69,743
Balance (in shares) at Sep. 30, 2010		10,040,000
Balance at Jun. 30, 2010		1,002	53,789	(20,508)	66,650
Balance (in shares) at Jun. 30, 2010		10,018,000
Comprehensive income:
Net income	3,093	0	0	0	3,093
Other comprehensive income, net of tax:
Changes in unrealized loss on derivative instruments	(2)	0	0	(2)	0
Comprehensive income	3,091
Issuance of common stock through stock plan transactions	229	2	227	0	0
Issuance of common stock through stock plan transactions (in shares)		26,000
Issuance of restricted stock	0	0	0	0	0
Issuance of restricted stock (in shares)		3,000
Forfeiture of restricted stock	0	0	0	0	0
Forfeiture of restricted stock (in shares)		(3,000)
Release of restricted stock	(41)	0	(41)	0	0
Release of restricted stock (in shares)		(4,000)
Share-based compensation	189	0	189	0	0
Tax benefit from stock plan transactions	(4)	0	(4)	0	0
Balance at Sep. 30, 2010	104,397	1,004	54,160	(20,510)	69,743
Balance (in shares) at Sep. 30, 2010		10,040,000
Balance at Dec. 31, 2010	107,185	1,004	54,138	(21,691)	73,734
Balance (in shares) at Dec. 31, 2010	10,040,029	10,040,000
Comprehensive income:
Net income	7,423	0	0	0	7,423
Other comprehensive income, net of tax:
Settlement of derivative instrument	282	0	0	282	0
Comprehensive income	7,705
Issuance of common stock through stock plan transactions	1,713	26	1,687	0	0
Issuance of common stock through stock plan transactions (in shares)		268,000
Issuance of restricted stock	0	5	(5)	0	0
Issuance of restricted stock (in shares)		50,000
Forfeiture of restricted stock	0	(1)	1	0	0
Forfeiture of restricted stock (in shares)		(13,000)
Repurchased shares	(310)	(2)	(308)	0	0
Repurchased shares (in shares)		(21,000)
Release of restricted stock	(177)	(1)	(176)	0	0
Release of restricted stock (in shares)		(13,000)
Share-based compensation	521	0	521	0	0
Tax benefit from stock plan transactions	577	0	577	0	0
Balance at Sep. 30, 2011	117,214	1,031	56,435	(21,409)	81,157
Balance (in shares) at Sep. 30, 2011	10,311,273	10,311,000
Balance at Jun. 30, 2011	113,779	1,031	56,278	(21,409)	77,879
Balance (in shares) at Jun. 30, 2011		10,315,000
Comprehensive income:
Net income	3,278	0	0	0	3,278
Other comprehensive income, net of tax:
Comprehensive income	3,278
Issuance of restricted stock	0	0	0	0	0
Issuance of restricted stock (in shares)		4,000
Forfeiture of restricted stock	0	0	0	0	0
Forfeiture of restricted stock (in shares)		(4,000)
Release of restricted stock	(37)	0	(37)	0	0
Release of restricted stock (in shares)		(4,000)
Share-based compensation	192	0	192	0	0
Tax benefit from stock plan transactions	2	0	2	0	0
Balance at Sep. 30, 2011	$ 117,214	$ 1,031	$ 56,435	$ (21,409)	$ 81,157
Balance (in shares) at Sep. 30, 2011	10,311,273	10,311,000