Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 26, 2020	Dec. 28, 2019
Income Statement [Abstract]
Operating revenues	$ 64,449	$ 56,446
Operating costs	55,998	48,530
Gross profit	8,451	7,916
Selling, general and administrative expenses	8,834	9,317
Operating loss	(383)	(1,401)
Other income (expense):
Interest expense, net	(153)	(31)
Other income, net	14	49
Loss before income taxes	(522)	(1,383)
Provision for federal and state income taxes	(103)	(83)
Net loss	$ (625)	$ (1,466)
Basic and diluted loss per common share	$ (0.02)	$ (0.05)
Basic and diluted weighted average shares used in computing loss per share (in thousands)	27,474	27,414