Consolidated Statements of Shareholders' Equity (USD $)	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Beginning balance at Dec. 31, 2011	$ 59,090,000	$ 251,000	$ 574,266,000	$ (518,592,000)	$ 3,165,000
Beginning balance, shares at Dec. 31, 2011		25,108,754
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	5,392,000			5,392,000
Foreign currency translation adjustments	363,000				363,000
Issuances of common stock:
Restricted share awards, shares		500,128
Restricted share awards	0	5,000	(5,000)
Shares issued for stock offering, shares		2,500,000
Shares issued for stock offering	14,682,000	25,000	14,657,000
Restricted shares remitted by employees for taxes, shares		(161,514)
Restricted shares remitted by employees for taxes	(1,605,000)	(2,000)	(1,603,000)
Stock option exercises, shares		141,849
Stock option exercises	559,000	2,000	557,000
Forfeited restricted share awards, shares		(196,085)
Forfeited restricted share awards	0	(2,000)	2,000
Stock-based compensation expense	6,171,000		6,171,000
Ending balance at Dec. 31, 2012	84,652,000	279,000	594,045,000	(513,200,000)	3,528,000
Ending balance, shares at Dec. 31, 2012		27,893,132
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(186,000)			(186,000)
Foreign currency translation adjustments	(1,414,000)				(1,414,000)
Issuances of common stock:
Restricted share awards, shares		665,629
Restricted share awards	0	7,000	(7,000)
Shares issued for acquisition, shares		217,155
Shares issued for acquisition	1,472,000	2,000	1,470,000	0	0
Shares issued for stock offering, shares		687,385
Shares issued for stock offering	4,118,000	7,000	4,111,000
Restricted shares remitted by employees for taxes, shares		(259,116)
Restricted shares remitted by employees for taxes	(1,757,000)	(3,000)	(1,754,000)
Stock option exercises, shares		202,159
Stock option exercises	916,000	2,000	914,000
2006 MIP Performance Unit settlements, shares		52,912
2006 MIP Performance Unit settlements	0	1,000	(1,000)
Forfeited restricted share awards, shares		(91,817)
Forfeited restricted share awards	0	(1,000)	1,000
Repurchases of common stock		0
Stock-based compensation expense	6,027,000		6,027,000
Ending balance at Dec. 31, 2013	93,828,000	294,000	604,806,000	(513,386,000)	2,114,000
Ending balance, shares at Dec. 31, 2013	29,367,439	29,367,439
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(7,526,000)			(7,526,000)
Foreign currency translation adjustments	(551,000)				(551,000)
Issuances of common stock:
Restricted share awards, shares		220,442
Restricted share awards	0	2,000	(2,000)
Shares issued for acquisition, shares		187,620
Shares issued for acquisition	1,279,000	2,000	1,277,000
Restricted shares remitted by employees for taxes, shares		(72,834)
Restricted shares remitted by employees for taxes	(568,000)	(1,000)	(567,000)
Stock option exercises, shares		716,780
Stock option exercises	2,823,000	7,000	2,816,000
2006 MIP Performance Unit settlements, shares		16,526
2006 MIP Performance Unit settlements	0	1,000	(1,000)
Forfeited restricted share awards, shares		(67,970)
Forfeited restricted share awards	0	(1,000)	1,000
Repurchases of common stock, shares		(3,605,142)
Repurchases of common stock	(22,685,000)	(36,000)	(22,649,000)	0	0
Stock-based compensation expense	4,386,000		4,386,000
Ending balance at Dec. 31, 2014	$ 70,986,000	$ 268,000	$ 590,067,000	$ (520,912,000)	$ 1,563,000
Ending balance, shares at Dec. 31, 2014	26,762,861	26,762,861