Consolidated Balance Sheets (Parentheticals) - $ / shares	Dec. 31, 2017	Jan. 01, 2017
Preferred stock, par value	$ 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	$ 0.001	$ 0.001
Common stock, shares authorized	367,500,000	367,500,000
Common stock, shares issued	149,570,870	148,079,718
Common Stock, Shares, Outstanding	139,479,270	138,510,325
Common stock held in treasury	10,091,600	9,569,393