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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
 9 Months Ended
Sep. 29, 2012
Sep. 24, 2011
Cash flows from operating activities:    
Net (loss) income $ (14,660,776) $ 3,146,362
Adjustments to reconcile net (loss) income to net cash provided by operating activities:    
Depreciation and amortization 7,634,175 5,996,918
Amortization of premium or discount on marketable debt securities (222,658) (110,162)
Stock-based compensation 3,773,306 2,176,820
Net gain on sale of investments (856,170) (368,641)
Losses in unconsolidated affiliates 592,480 203,834
Impairment on investments 557,594 0
Impairment of goodwill 1,704,770 0
Deferred income tax asset 729,190 0
Foreign currency losses 595,016 (326,465)
Impairment of marketable debt securities 0 150,644
Change in allowance for bad debt (85,038) (107,726)
Change in inventory reserves 668,320 408,900
Change in warranty reserves (300,000) 0
Changes in assets and liabilities:    
Accounts receivable 3,150,525 1,358,326
Inventory 297,273 2,862,935
Prepaid expenses and other current assets 168,068 721,068
Accounts payable and accrued expenses (1,998,170) (4,248,968)
Billings in excess of revenue earned (252,572) (747,914)
Net cash provided by operating activities 1,495,333 11,115,931
Cash flows from investing activities:    
Proceeds from sale of marketable debt securities 33,315,471 36,872,779
Purchase of marketable debt securities (39,706,955) (38,976,135)
Cash paid to acquire Ikanos, net of cash acquired 93,872 0
Cash paid to acquire FDD, net of cash acquired 94,351 (10,084,307)
Purchase of investments (2,249,784) 0
Proceeds from sale of investments 856,170 392,196
Other assets 77,383 32,919
Capital expenditures (8,464,076) (5,730,749)
Net cash used in investing activities (15,983,568) (17,493,297)
Cash flows from financing activities:    
Treasury stock purchases (3,455,529) (3,060,156)
Proceeds from exercise of stock options 0 72,445
Settlements of restricted stock for tax withholding obligations (100,676) (72,374)
Net cash used in financing activities (3,556,205) (3,060,085)
Effect of exchange rate changes on cash 212,516 (233,754)
Net decrease in cash and equivalents (17,831,924) (9,671,205)
Cash and equivalents:    
Beginning of period 43,095,163 49,834,547
Supplemental disclosure of cash flow information:    
Income taxes paid 197,000 163,000
Supplemental schedule of noncash investing activities:    
Construction in progress included in accrued expenses $ 0 $ 526,000