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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
 12 Months Ended
Dec. 27, 2013
Dec. 28, 2012
Dec. 30, 2011
Cash flows from operating activities:      
Net income (loss) $ 2,630,000 $ (17,300,000) $ 1,830,000
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:      
Non-cash revenue from subcontractor settlement     (902,000)
Depreciation and amortization 585,000 737,000 944,000
Deferred income taxes   (2,249,000) 1,465,000
Goodwill impairment   15,208,000  
Lease abandonment expense, net 30,000 26,000 2,000
(Gain) loss on sale of equipment (6,000) 18,000 2,000
Provision for doubtful accounts 101,000 673,000 209,000
Stock-based compensation 150,000 227,000 201,000
Changes in operating assets and liabilities:      
Accounts receivable 2,216,000 625,000 (2,507,000)
Costs and estimated earnings in excess of billings on uncompleted contracts 225,000 10,812,000 (8,427,000)
Other receivables (117,000) 80,000 1,000
Prepaid expenses and other current assets (595,000) (58,000) (10,000)
Other assets (26,000) 76,000 24,000
Accounts payable (3,026,000) (1,199,000) 2,802,000
Accrued liabilities 502,000 (4,886,000) 4,206,000
Billings in excess of costs and estimated earnings on uncompleted contracts (1,172,000) 2,667,000 (289,000)
Deferred lease obligations (284,000) (186,000) (234,000)
Net cash provided by (used in) operating activities 1,213,000 5,271,000 (683,000)
Cash flows from investing activities:      
Purchase of equipment and leasehold improvements (306,000) (359,000) (395,000)
Proceeds from sale of equipment 27,000 20,000 6,000
Payments related to business acquisitions     (2,733,000)
Net cash used in investing activities (279,000) (339,000) (3,122,000)
Cash flows from financing activities:      
Changes in excess of outstanding checks over bank balance 285,000 (589,000) 554,000
Payments on notes payable (621,000) (663,000) (211,000)
Proceeds from notes payable 510,000 614,000 667,000
Borrowings under line of credit   11,663,000 33,965,000
Repayments of line of credit (3,000,000) (8,919,000) (34,709,000)
Principal payments on capital leases (62,000) (164,000) (202,000)
Proceeds from stock option exercise 9,000 11,000 7,000
Proceeds from sales of common stock under employee stock purchase plan 73,000 120,000 93,000
Net cash (used in) provided by financing activities (2,806,000) 2,073,000 164,000
Net (decrease) increase in cash and cash equivalents (1,872,000) 7,005,000 (3,641,000)
Cash and cash equivalents, including restricted cash, at beginning of the year 10,006,000 3,001,000 6,642,000
Cash and cash equivalents, including restricted cash, at end of the year 8,134,000 10,006,000 3,001,000
Cash paid during the period for:      
Interest 100,000 106,000 77,000
Income taxes 324,000 139,000 139,000
Supplemental disclosures of noncash investing and financing activities:      
Equipment acquired under capital leases $ 87,000 $ 151,000 $ 247,000