Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 30, 2017	Dec. 31, 2016
Common Class A
Common Stock, par value	$ 0.01	$ 0.01
Common Stock, shares authorized	22,700,000	22,700,000
Common Stock, shares issued	8,603,152	9,170,956
Common Stock, shares outstanding	8,603,152	9,170,956
Common Class B
Common Stock, par value	$ 0.01	$ 0.01
Common Stock, shares authorized	4,200,000	4,200,000
Common Stock, shares issued	3,017,983	3,197,355
Common Stock, shares outstanding	3,017,983	3,197,355