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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
 6 Months Ended
Jul. 01, 2011
Jul. 02, 2010
Cash flows from operating activities:    
Net income $ 444,000 $ 1,650,000
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation and amortization 519,000 518,000
Lease abandonment expense, net 9,000 13,000
Loss (gain) on sale of equipment 7,000 (19,000)
Provision for doubtful accounts 64,000 210,000
Stock-based compensation 108,000 128,000
Changes in operating assets and liabilities:    
Accounts receivable 3,148,000 (1,646,000)
Costs and estimated earnings in excess of billings on uncompleted contracts (4,340,000) (4,571,000)
Other receivables 3,000 41,000
Prepaid expenses and other current assets 294,000 (4,000)
Other assets 21,000 (38,000)
Accounts payable (1,394,000) (71,000)
Accrued liabilities 2,505,000 1,836,000
Billings in excess of costs and estimated earnings on uncompleted contracts 272,000 350,000
Deferred lease obligations (76,000) (134,000)
Net cash provided by (used in) operating activities 1,584,000 (1,737,000)
Cash flows from investing activities:    
Purchase of equipment and leasehold improvements (263,000) (241,000)
Proceeds from sale of equipment 1,000 30,000
Net cash used in investing activities (262,000) (211,000)
Cash flows from financing activities:    
Changes in excess of outstanding checks over bank balance 289,000 310,000
Payments on notes payable (43,000) (20,000)
Proceeds from notes payable 23,000  
Borrowings under line of credit 13,667,000 5,470,000
Repayments on line of credit (14,667,000) (5,470,000)
Principal payments on capital lease obligations (101,000) (81,000)
Proceeds from sales of common stock under employee stock purchase plan 42,000 47,000
Net cash (used in) provided by financing activities (790,000) 256,000
Net increase (decrease) in cash and cash equivalents 532,000 (1,692,000)
Cash and cash equivalents at beginning of the period 6,642,000 8,445,000
Cash and cash equivalents at end of the period 7,174,000 6,753,000
Cash paid during the period for:    
Interest 37,000 28,000
Income taxes 18,000 2,000
Supplemental disclosures of noncash investing and financing activities:    
Equipment acquired under capital lease obligations 103,000 51,000
Purchase price payable $ 2,733,000 $ 2,000,000