Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 86	$ 87
Common stock, par value (in dollars per share)	$ 0.04	$ 0.04
Common stock, shares authorized (in shares)	240,000,000	240,000,000
Common stock, shares issued (in shares)	77,467,665	70,875,998
Common stock, shares outstanding (in shares)	77,458,270	70,866,603
Treasury stock (in shares)	9,395	9,395