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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
 12 Months Ended
Dec. 30, 2011
Dec. 31, 2010
Jan. 01, 2010
Cash flows from operating activities:      
Net income (loss) $ 1,830,000 $ 2,720,000 $ (5,575,000)
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:      
Non-cash revenue from subcontractor settlement (902,000)    
Depreciation and amortization 944,000 1,053,000 1,814,000
Deferred income taxes 1,465,000 389,000 (1,890,000)
Goodwill impairment     2,763,000
Lease abandonment expense (recovery), net 2,000 (68,000) 707,000
Loss (gain) on sale of equipment 2,000 (17,000) 6,000
Provision for doubtful accounts 209,000 20,000 1,829,000
Stock-based compensation 201,000 235,000 272,000
Changes in operating assets and liabilities:      
Accounts receivable (2,507,000) (4,407,000) 936,000
Costs and estimated earnings in excess of billings on uncompleted contracts (8,427,000) (4,694,000) 1,632,000
Income tax receivable   51,000 905,000
Other receivables 1,000 (103,000) (25,000)
Prepaid expenses and other current assets (10,000) (214,000) 284,000
Other assets 24,000 (89,000) 55,000
Accounts payable 2,802,000 3,923,000 (654,000)
Accrued liabilities 4,206,000 1,476,000 (959,000)
Billings in excess of costs and estimated earnings on uncompleted contracts (289,000) 11,000 326,000
Deferred lease obligations (234,000) (189,000) (272,000)
Net cash (used in) provided by operating activities (683,000) 97,000 2,154,000
Cash flows from investing activities:      
Purchase of equipment and leasehold improvements (395,000) (685,000) (386,000)
Proceeds from sale of equipment 6,000 40,000  
Payments related to business acquisitions (2,733,000) (2,104,000) (2,373,000)
Net cash used in investing activities (3,122,000) (2,749,000) (2,759,000)
Cash flows from financing activities:      
Changes in excess of outstanding checks over bank balance 554,000 735,000 40,000
Payments on notes payable (211,000) (17,000) (46,000)
Proceeds from notes payable 667,000 214,000  
Borrowings under line of credit 33,965,000 14,123,000 3,553,000
Repayments of line of credit (34,709,000) (14,123,000) (2,553,000)
Principal payments on capital leases (202,000) (173,000) (172,000)
Proceeds from stock option exercise 7,000 3,000  
Proceeds from sales of common stock under employee stock purchase plan 93,000 87,000 84,000
Net cash provided by financing activities 164,000 849,000 906,000
Net (decrease) increase in cash and cash equivalents (3,641,000) (1,803,000) 301,000
Cash and cash equivalents at beginning of the year 6,642,000 8,445,000 8,144,000
Cash and cash equivalents at end of the year 3,001,000 6,642,000 8,445,000
Cash paid during the period for:      
Interest 77,000 52,000 40,000
Income taxes 70,000 48,000 3,000
Supplemental disclosures of noncash investing and financing activities:      
Equipment acquired under capital leases $ 247,000 $ 240,000 $ 60,000