Consolidated Statements of Stockholders' Equity - USD ($)	Common Stock [Member]	Treasury Stock [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]	Total
Balance at Dec. 31, 2012	$ 122,272,000		$ (579,000)	$ 168,164,000	$ 289,857,000
Net income (loss)				7,647,000	7,647,000
Payment of dividends				$ (876,000)	(876,000)
Exercise of stock options and employee stock purchases (12 shares)	$ 122,000				122,000
Stock-based compensation	$ 1,724,000				1,724,000
Change in fair value of interest rate hedge			$ 142,000		142,000
Balance at Dec. 31, 2013	$ 124,118,000		$ (437,000)	$ 174,935,000	298,616,000
Net income (loss)				(19,064,000)	(19,064,000)
Payment of dividends				$ (878,000)	(878,000)
Exercise of stock options and employee stock purchases (12 shares)	$ 147,000				147,000
Stock-based compensation	$ 2,074,000				2,074,000
Change in fair value of interest rate hedge			$ (113,000)		(113,000)
Balance at Dec. 31, 2014	$ 126,339,000		(549,000)	$ 154,991,000	280,781,000
Other			$ 1,000	(2,000)	(1,000)
Net income (loss)				(26,777,000)	(26,777,000)
Payment of dividends				$ (879,000)	(879,000)
Exercise of stock options and employee stock purchases (12 shares)	$ 30,000				30,000
Stock-based compensation	$ 1,759,000				1,759,000
Change in fair value of interest rate hedge			$ 479,000		479,000
Balance at Dec. 31, 2015	$ 128,129,000	$ (699,000)	$ (70,000)	$ 127,335,000	254,695,000
Other	$ 1,000				1,000
Repurchase of common stock		$ (699,000)			$ (699,000)