Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016
Income Statement [Abstract]
Operating revenues	$ 55,765	$ 59,224
Operating costs	49,327	49,112
Gross profit	6,438	10,112
Operating costs and expenses:
Selling, general, and administrative expenses	12,581	13,350
Operating loss	(6,143)	(3,238)
Other income (expense)
Interest expense, net	(104)	(173)
Other income, net	76	42
Loss before income taxes	(6,171)	(3,369)
Benefit (provision) for federal and state income taxes	(10,087)	1,027
Net loss	$ (16,258)	$ (2,342)
Basic and diluted loss per common share	$ (0.59)	$ (0.08)
Basic and diluted weighted average shares used in computing loss per share:	27,352,000	27,653,000