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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
 9 Months Ended
Sep. 28, 2012
Sep. 30, 2011
Cash flows from operating activities:    
Net (loss) income $ (17,600,000) $ 2,609,000
Adjustments to reconcile net (loss) income to net cash provided by operating activities:    
Non-cash revenue from subcontractor settlement   (902,000)
Depreciation and amortization 569,000 733,000
Lease abandonment expense, net 27,000 9,000
Deferred income taxes (3,584,000)  
Impairment of goodwill 15,208,000  
Loss on sale of equipment 17,000 1,000
Provision for doubtful accounts 793,000 131,000
Stock-based compensation 181,000 148,000
Changes in operating assets and liabilities:    
Accounts receivable 1,910,000 (402,000)
Costs and estimated earnings in excess of billings on uncompleted contracts 9,518,000 (5,075,000)
Other receivables 47,000 (66,000)
Prepaid expenses and other current assets 652,000 709,000
Other assets 30,000 12,000
Accounts payable (3,236,000) 1,546,000
Accrued liabilities (2,656,000) 3,653,000
Billings in excess of costs and estimated earnings on uncompleted contracts 2,855,000 115,000
Deferred lease obligations (126,000) (158,000)
Net cash provided by operating activities 4,605,000 3,063,000
Cash flows from investing activities:    
Purchase of equipment and leasehold improvements (275,000) (309,000)
Proceeds from sale of equipment 14,000 6,000
Payments for business acquisition   (2,733,000)
Net cash used in investing activities (261,000) (3,036,000)
Cash flows from financing activities:    
Changes in excess of outstanding checks over bank balance (281,000) (234,000)
Payments on notes payable (582,000) (48,000)
Proceeds from notes payable   23,000
Borrowings under line of credit 11,663,000 22,682,000
Repayments on line of credit (8,919,000) (20,762,000)
Principal payments on capital lease obligations (126,000) (152,000)
Proceeds from stock option exercise 10,000 4,000
Proceeds from sales of common stock under employee stock purchase plan 120,000 93,000
Net cash provided by financing activities 1,885,000 1,606,000
Net increase in cash and cash equivalents 6,229,000 1,633,000
Cash and cash equivalents at beginning of the period 3,001,000 6,642,000
Cash and cash equivalents at end of the period 9,230,000 8,275,000
Cash paid during the period for:    
Interest 79,000 51,000
Income taxes 59,000 51,000
Supplemental disclosures of noncash investing and financing activities:    
Equipment acquired under capital lease obligations $ 93,000 $ 159,000