Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Jan. 02, 2016	Jan. 03, 2015
Operating activities
Net income (loss)	$ 1,413	$ (5,459)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation, depletion and amortization	2,421	2,791
Provision for future reclamation associated with the Pueblo aggregates deposit		4,000
Write-off of deferred development costs associated with Pueblo aggregates deposit		1,257
Write-off of prepaid royalties associated with the Pueblo aggregates deposit		401
Deferred income tax provision	771	(3,108)
Compensation of Board of Directors paid by issuance of treasury shares	197	217
Provision for doubtful accounts	63	89
Gain on disposition of property and equipment	(225)	(1)
Changes in working capital items:
Receivables	(2,767)	1,802
Inventories	(2,170)	(1,264)
Prepaid expenses	(499)	(282)
Prepaid royalties		99
Accounts payable and accrued expenses	1,960	(333)
Income taxes payable and refundable	394	348
Other		25
Net cash provided by operating activities	1,558	582
Investing activities
Capital expenditures	(2,303)	(2,224)
Cash proceeds from sale of property and equipment	233	1
Net cash used in investing activities	(2,070)	(2,223)
Financing activities
Borrowings on the revolving bank loan, net	400	4,800
Repayments of long-term debt		(3,408)
Payments to acquire treasury stock	(16)
Net cash provided by financing activities	384	1,392
Net decrease in cash and cash equivalents	(128)	(249)
Cash and cash equivalents:
Beginning of year	675	924
End of year	547	675
Cash paid (received) during the year
Interest	412	428
Income taxes refunded, net	$ (388)	(721)
Supplemental disclosures of noncash investing and financing activities
Exchange of accounts receivable for other long-term asset		854
Capital expenditures purchased on account		$ 383