Consolidated Statements of Stockholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive (Loss) Income	Retained Earnings	Treasury Stock	Total
Balances at Dec. 31, 2011	$ 645	$ 17,199	$ (3,001)	$ 136,910	$ (8,740)	$ 143,013
Balances (in shares) at Dec. 31, 2011	6,235,439
Increase (Decrease) in Stockholders' Equity
Stock options exercised	1	74				75
Stock options exercised (in shares)	10,000
Stock-based compensation	2	1,080				1,082
Stock-based compensation (in shares)	16,998
Treasury shares purchased					(40,847)	(40,847)
Treasury shares purchased (in shares)	(704,429)
Net income				16,423		16,423
Minimum pension liability adjustments, net of tax (benefit) expense of $(46), $112 and $36, for 2014, 2013 and 2012, respectively			64			64
Mark to market of interest rate hedges, net of tax expense of $317, $398 and $312 for 2014, 2013 and 2012, respectively			545			545
Comprehensive income			609	16,423		17,032
Balances at Dec. 31, 2012	648	18,353	(2,392)	153,333	(49,587)	120,355
Balances (in shares) at Dec. 31, 2012	5,558,008
Increase (Decrease) in Stockholders' Equity
Stock options exercised	1	33				34
Stock options exercised (in shares)	5,262
Stock-based compensation	1	933				934
Stock-based compensation (in shares)	16,425
Treasury shares purchased					(212)	(212)
Treasury shares purchased (in shares)	(4,563)
Net income				14,800		14,800
Minimum pension liability adjustments, net of tax (benefit) expense of $(46), $112 and $36, for 2014, 2013 and 2012, respectively			197			197
Mark to market of interest rate hedges, net of tax expense of $317, $398 and $312 for 2014, 2013 and 2012, respectively			697			697
Comprehensive income			894	14,800		15,694
Balances at Dec. 31, 2013	650	19,319	(1,498)	168,133	(49,799)	136,805
Balances (in shares) at Dec. 31, 2013	5,575,132
Increase (Decrease) in Stockholders' Equity
Stock options exercised		(1)				(1)
Stock options exercised (in shares)	9,117
Stock-based compensation	2	1,100				1,102
Stock-based compensation (in shares)	15,268
Treasury shares purchased					(266)	(266)
Treasury shares purchased (in shares)	(4,198)
Cash dividends paid				(2,790)		(2,790)
Net income				19,367		19,367
Minimum pension liability adjustments, net of tax (benefit) expense of $(46), $112 and $36, for 2014, 2013 and 2012, respectively			(81)			(81)
Mark to market of interest rate hedges, net of tax expense of $317, $398 and $312 for 2014, 2013 and 2012, respectively			555			555
Comprehensive income			474	19,367		19,841
Balances at Dec. 31, 2014	$ 652	$ 20,418	$ (1,024)	$ 184,710	$ (50,065)	$ 154,691
Balances (in shares) at Dec. 31, 2014	5,595,319