Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 24, 2022	Sep. 30, 2023	Sep. 24, 2022
Condensed Consolidated Statements of Operations (Unaudited)
Operating revenues	$ 9,450	$ 13,056	$ 32,381	$ 31,777
Operating costs	7,613	12,392	32,748	30,439
Gross profit (loss)	1,837	664	(367)	1,338
Selling, general and administrative expenses	2,512	2,920	10,850	8,653
Operating loss	(675)	(2,256)	(11,217)	(7,315)
Other income (expense):
Other income, net	3	5	52	36
Interest expense, net	(27)	(63)	(158)	(166)
Loss from continuing operations before income taxes	(699)	(2,314)	(11,323)	(7,445)
Provision for federal and state income taxes	22	21	66	43
Net loss	$ (721)	$ (2,335)	$ (11,389)	$ (7,488)
Basic and diluted loss per common share:	$ (0.02)	$ (0.07)	$ (0.29)	$ (0.21)
Basic and diluted weighted average shares used in computing loss per share:	40,830	35,802	39,591	35,492