Consolidated Balance Sheets (Parenthetical) - $ / shares	Mar. 30, 2019	Dec. 29, 2018
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	8,634,806	8,580,593
Common Stock, shares outstanding	8,634,806	8,580,593
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	2,917,983	2,917,983
Common Stock, shares outstanding	2,917,983	2,917,983