Condensed Consolidated Balance Sheets (Parentheticals) (USD $) In Thousands, except Share data, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Current assets:
Allowance for doubtful accounts	$ 1,450	$ 1,049
Unamortized debt discount, current	10	10
Unamortized debt discount, noncurrent	$ 10	$ 0
Stockholders' Equity Note [Abstract]
Common stock, shares issued	38,435,320	38,088,391
Common stock, shares outstanding	38,394,811	38,047,882
Treasury stock, shares	40,509	40,509
Preferred stock, shares outstanding	0	0
Common stock, par value (per share)	$ 0.10	$ 0.10
Common stock, shares authorized	60,000,000	60,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares authorized	500,000	500,000
Preferred stock, par value (per share)	$ 0.10	$ 0.10