Condensed Consolidated Balance Sheets (Parentheticals) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 1,075	$ 1,157
Unamortized debt discount, current	0	13
Unamortized debt discount, noncurrent	$ 78	$ 0
Preferred stock, par value (per share)	$ 0.1	$ 0.10
Preferred stock, shares authorized	500,000	500,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (per share)	$ 0.1	$ 0.10
Common stock, shares authorized	60,000,000	60,000,000
Common stock, shares issued	37,208,639	37,131,777
Common stock, shares outstanding	37,168,130	37,091,268
Treasury stock, shares	40,509	40,509