Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017
Consolidated Statements of Income
Net sales	$ 163,983	$ 152,810
Type of Revenue [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember
Costs and expenses:
Cost of sales (exclusive of depreciation, depletion and amortization)	$ 136,176	$ 124,715
Depreciation, depletion and amortization	2,633	2,554
Selling and administrative	26,229	22,643
Charges related to cessation of mining an aggregates deposit	6,840
Charges related to write off of deferred development	627
Gain on disposition of property and equipment	(919)	(118)
Operating (loss) income	(7,603)	3,016
Interest income	76	79
Interest expense	(539)	(366)
Other income, net	25	110
(Loss) income before income taxes	(8,041)	2,839
Benefit (provision) for income taxes	2,185	(1,021)
Net (loss) income	$ (5,856)	$ 1,818
Basic and diluted (loss) income per share (in dollar per share)	$ (3.45)	$ 1.08
Average shares outstanding (in shares)	1,697	1,680