Consolidated Balance Sheets (Parentheticals) - $ / shares	Dec. 30, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Preferred stock par value per share (in dollars per share)	$ 0.001	$ 0.001
Preferred stock shares authorized	10,000,000	10,000,000
Preferred stock shares issued	0	0
Preferred stock shares outstanding	0	0
Common stock par value per share (in dollars per share)	$ 0.001	$ 0.001
Common stock shares authorized	367,500,000	367,500,000
Common stock shares issued	152,085,000	149,818,000
Common stock shares outstanding	141,180,000	139,661,000
Common stock shares held as treasury stock	10,905,000	10,158,000