Consolidated Statements of Shareholders’ Equity (USD $) In Thousands, except Share data	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Total
Stockholders' Equity, Beginning Balance at Dec. 31, 2010	$ 7	$ 41,280	$ 120,376	$ (182)	$ (1,919)
Treasury Stock, Shares, Beginning Balance at Dec. 31, 2010					282,850
Shares outstanding, Beginning Balance (shares) at Dec. 31, 2010	6,811,464
Common Stock issuance under Employee Stock Purchase Plan		252
Common Stock issuance under Employee Stock Purchase Plan (shares)	8,551
Exercise of stock options		375
Exercise of stock options (shares)	27,500					27,500
Share-based compensation		1,580
Net income (loss)			18,122			18,122
Net income on derivative instruments, net of tax				182		182
Stockholders' Equity, Ending Balance at Dec. 31, 2011	7	43,487	138,498		(1,919)
Shares outstanding, Ending Balance (shares) at Dec. 31, 2011	6,847,515
Treasury Stock, Shares, Beginning Balance at Dec. 31, 2011					282,850
Common Stock issuance under Employee Stock Purchase Plan		307
Common Stock issuance under Employee Stock Purchase Plan (shares)	9,578
Exercise of stock options		1,301
Exercise of stock options (shares)	72,050					72,050
Issuance of restricted common stock		34
Issuance of restricted common stock, shares	35,000
Share-based compensation		1,615
Purchase of treasury stock					(234)
Purchase of treasury stock (shares)	(5,831)				5,831
Net income (loss)			14,617			14,617
Stockholders' Equity, Ending Balance at Dec. 31, 2012	7	46,744	153,115		(2,153)	197,713
Treasury Stock, Shares, Ending Balance at Dec. 31, 2012					288,681	288,681
Shares outstanding, Ending Balance (shares) at Dec. 31, 2012	6,958,312
Common Stock issuance under Employee Stock Purchase Plan		269
Common Stock issuance under Employee Stock Purchase Plan (shares)	10,520
Exercise of stock options		848
Exercise of stock options (shares)	55,625					55,625
Forfeiture of restricted common stock, shares	(3,000)
Share-based compensation		1,827
Purchase of treasury stock					(137)
Purchase of treasury stock (shares)	(4,174)				4,174
Net income (loss)			(4,062)			(4,062)
Stockholders' Equity, Ending Balance at Dec. 31, 2013	$ 7	$ 49,688	$ 149,053		$ (2,290)	$ 196,458
Treasury Stock, Shares, Ending Balance at Dec. 31, 2013					292,855	292,855
Shares outstanding, Ending Balance (shares) at Dec. 31, 2013	7,017,283