Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Earnings (Deficit) [Member]	Treasury Stock [Member]	Total
Balance at beginning of year at Dec. 26, 2015	$ 28	$ 37,185	$ 2,799
Share-based compensation - employee		489
Share-based compensation - nonemployee
Stock repurchased				(1,353)
Treasury stock retired	(1)	(1,352)		1,353
Net income (loss)			(2,342)		(2,342)
Balance at end of year at Dec. 31, 2016	27	36,322	457		36,806
Share-based compensation - employee		387
Share-based compensation - nonemployee		225			225
Stock repurchased				(91)
Treasury stock retired		(91)		91	1,500
Net income (loss)			(16,258)		(16,258)
Balance at end of year at Dec. 30, 2017	$ 27	$ 36,843	$ (15,801)		$ 21,069