Condensed Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Current assets:
Allowance for doubtful accounts	$ 1,449	$ 1,619
Unamortized debt discount, current	9	7
Unamortized debt discount, noncurrent	$ 0	$ 7
Stockholders' Equity Note [Abstract]
Common stock, shares issued	34,937,055	36,232,074
Common stock, shares outstanding	34,937,055	36,191,565
Treasury stock, shares	0	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