Consolidated Balance Sheets (Parenthetical) - $ / shares	Sep. 26, 2020	Dec. 28, 2019
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	9,868,649	9,370,526
Common Stock, shares outstanding	9,868,649	9,370,526
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	2,307,983	2,672,983
Common Stock, shares outstanding	2,307,983	2,672,983