Condensed Consolidated Statement of Changes In Stockholders Equity (Unaudited) - 3 months ended Mar. 27, 2018 - USD ($) $ in Thousands	Total	Class A Common Stock [Member]	Class B Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Non-controlling Interests [Member]
Stockholders' equity at Dec. 26, 2017	$ 144,149	$ 204	$ 56	$ 113,475	$ 4,144	$ 26,270
Stockholders' equity, Shares at Dec. 26, 2017		20,378,452	5,646,572
Net income	689				654	35
Deferred tax assets	(14)			(14)
Tax distributions	(64)					(64)
Other distributions	(21)					(21)
Exchanges		$ 1	$ (1)
Exchanges, Shares		67,069	(67,069)
Restricted stock units vested		43,328
Non-controlling interests adjustment				438		(438)
Forfeiture of Class B common stock			(887)
Stock-based compensation	667			505		162
Stockholders' equity at Mar. 27, 2018	$ 145,407	$ 205	$ 56	$ 114,404	$ 4,798	$ 25,944
Stockholders' equity , Shares at Mar. 27, 2018		20,488,849	5,578,616