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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) | 6 Months Ended
--- | ---
Jun. 30, 2012 | Jun. 25, 2011
Cash flows from operating activities: |  |
Net (loss) income | $ (7,592,880) | $ 2,802,132
Adjustments to reconcile net (loss) income to net cash provided by operating activities: |  |
Depreciation and amortization | 5,132,790 | 3,812,998
Amortization of premium or discount on marketable debt securities | (142,119) | (82,219)
Stock-based compensation | 2,223,828 | 1,470,524
Net gain on sale of investments | (856,170) | (368,641)
Losses in unconsolidated affiliates | 390,202 | 154,238
Impairment of goodwill | 1,704,770 |
Deferred income tax asset | 581,370 |
Foreign currency losses | 98,441 | 575,580
Change in allowance for bad debt | (124,976) | (360,375)
Change in inventory reserves | 547,318 | 271,636
Change in warranty reserves | (300,000) |
Changes in assets and liabilities: |  |
Accounts receivable | 3,061,759 | (2,065,893)
Inventory | 29,185 | 2,786,195
Prepaid expenses and other current assets | 69,014 | 210,907
Accounts payable and accrued expenses | (3,538,983) | (5,069,743)
Billings in excess of revenue earned | (50,000) | (606,121)
Net cash provided by operating activities | 1,233,549 | 3,531,218
Cash flows from investing activities: |  |
Proceeds from sale of marketable debt securities | 17,579,205 | 14,997,567
Purchase of marketable debt securities | (20,275,585) | (19,854,118)
Cash paid to acquire FDD, net of cash acquired | 94,351 | (10,084,307)
Purchase of investments | (2,249,784) |
Proceeds from sale of investments | 856,170 | 392,196
Other assets | 73,189 | (19,655)
Capital expenditures | (5,748,450) | (3,865,205)
Net cash used in investing activities | (9,670,904) | (18,433,522)
Cash flows from financing activities: |  |
Treasury stock purchases | (3,455,529) | (1,907,324)
Proceeds from exercise of stock options |  | 72,445
Settlements of restricted stock for tax withholding obligations | (96,917) | (63,069)
Net cash used in financing activities | (3,552,446) | (1,897,948)
Effect of exchange rate changes on cash | 54,834 | 136,116
Net decrease in cash and equivalents | (11,934,967) | (16,664,136)
Cash and equivalents: |  |
Beginning of period | 43,095,163 | 49,834,547
End of period | 31,160,196 | 33,170,411
Supplemental disclosure of cash flow information: |  |
Income taxes paid | 197,000 | 139,000
Supplemental schedule of noncash investing activities: |  |
Construction in progress included in accrued expenses | $ 361,000 | $ 995,000

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Period Type: | duration

X
- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration