Consolidated Balance Sheets (Parenthetical) - $ / shares	Mar. 27, 2021	Dec. 26, 2020
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	10,052,711	10,004,681
Common Stock, shares outstanding	10,052,711	10,004,681
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	2,177,983	2,177,983
Common Stock, shares outstanding	2,177,983	2,177,983