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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 28, 2012
Dec. 30, 2011
Dec. 31, 2010
Cash flows from operating activities:      
Net income (loss) $ (1,763) $ 1,348 $ 53
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:      
Income from discontinued operations 0 0 (4,166)
Depreciation of property and equipment 1,309 1,469 1,590
Amortization of intangibles 652 797 816
Amortization of discount 0 0 236
Deferred income taxes 143 367 253
Loss on extinguishment of debt 0 0 267
Fair value adjustment of warrant (335) 117 144
Change in net pension liability 205 257 318
Loss (gain) on disposal of property and equipment 131 13 (2)
Stock-based compensation expense 3,208 1,914 1,248
Accretion of asset retirement obligation 16 0 0
Other 77 (320) 93
Changes in working capital:      
Accounts receivable trade, net 224 (435) (207)
Inventories (1,020) (85) 1,521
Prepaids, deposits and other current assets (298) (145) 780
Accounts payable 1,014 480 (1,204)
Other current liabilities (346) (431) (5,522)
Net cash provided by operating activities of discontinued operations 0 0 (635)
Net cash provided by (used in) operating activities 3,217 5,346 (4,417)
Cash flows from investing activities:      
Proceeds from sale of subsidiary, net of transaction costs 0 0 11,824
Acquisition of property and equipment (2,271) (962) (320)
Proceeds from the sale of property and equipment 0 26 29
Net change in other assets (4) 47 24
Purchase of short-term investments 0 0 (219)
Sale of short-term investments 0 0 87
Decrease in restricted cash, including reinvested interest 129 0 7,396
Net cash used in investing activities of discontinued operations 0 0 (50)
Net cash (used in) provided by investing activities (2,146) (889) 18,771
Cash flows from financing activities:      
Repayment of notes payable 0 0 (5,000)
Borrowings under lines of credit 3,510 0 0
Repayment of capital lease lines of credit (741) (575) (796)
Proceeds from the exercise of stock options 1,514 3,343 1,124
Redemption of Series A preferred stock 0 0 (6,800)
Net cash used in financing activities of discontinued operations 0 0 (50)
Net cash provided by (used in) financing activities 4,283 2,768 (11,522)
Effect of exchange rate changes on cash and cash equivalents (261) (19) 214
Increase in cash and cash equivalents 5,093 7,206 3,046
Cash and cash equivalents, at beginning of year 16,582 9,376 6,330
Cash and cash equivalents, at end of year $ 21,675 $ 16,582 $ 9,376