Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016
Operating activities
Net income	$ 1,818	$ 3,686
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	2,554	2,436
Write-off of prepaid royalties associated with the Pueblo aggregates deposit		632
Deferred income tax provision		1,533
Compensation of Board of Directors paid by issuance of treasury shares	326	152
Provision for doubtful accounts	134	280
Gain on disposition of property and equipment	(118)	(287)
Changes in working capital items:
Receivables	(1,970)	44
Inventories	286	(999)
Prepaid expenses	(94)	331
Accounts payable and accrued expenses	864	2,666
Income taxes payable and refundable	682	(669)
Other	(95)	(1,706)
Net cash provided by operating activities	4,387	8,099
Investing activities:
Capital expenditures	(5,781)	(4,405)
Cash proceeds from sale of property and equipment	126	310
Net cash used in investing activities	(5,655)	(4,095)
Financing activities:
Borrowings on the revolving bank loan	32,100	27,250
Repayments on the revolving bank loan	(30,600)	(31,450)
Payments to acquire treasury stock	(26)	(50)
Net cash provided by (used in) financing activities	1,474	(4,250)
Net increase (decrease) in cash and cash equivalents	206	(246)
Cash and cash equivalents:
Beginning of period	301	547
End of period	507	301
Cash paid during the year for:
Interest, net	403	365
Income taxes, net	$ 339	$ 1,285