Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 26, 2015
Income Statement [Abstract]
Operating revenues	$ 59,224	$ 79,605
Operating costs	49,112	63,337
Gross profit	10,112	16,268
Operating costs and expenses:
Selling, general, and administrative expenses	13,350	14,168
Operating income (loss)	(3,238)	2,100
Other income (expense)
Interest expense, net	(173)	(135)
Other income, net	42	357
Income (loss) before income taxes	(3,369)	2,322
Benefit for federal and state income taxes	1,027	8,214
Net income (loss)	$ (2,342)	$ 10,536
Basic and diluted income (loss) per common share	$ (0.08)	$ 0.38
Basic and diluted weighted average shares used in computing income (loss) per share:	27,653	28,023