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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
 12 Months Ended
Dec. 29, 2012
Dec. 31, 2011
Dec. 25, 2010
Cash flows from operating activities:      
Net (loss) income $ (18,994,272) $ 3,684,571 $ 8,839,546
Adjustments to reconcile net (loss) income to net cash provided by operating activities:      
Depreciation and amortization 9,111,943 8,598,672 6,565,365
Accretion (amortization) of premium or discount on marketable debt securities (287,439) (152,665) 69,891
Stock-based compensation 4,486,990 3,923,628 2,583,728
Net gain on investment transactions (856,170) (368,641) (2,597,505)
Losses in unconsolidated affiliates 679,587 296,451 600,299
Impairment on marketable debt securities 0 150,644 0
Impairment of intangible assets and goodwill 1,704,770 4,999,512 0
Release of valuation allowance on deferred tax assets 0 (4,266,000) 0
Deferred income taxes 2,162,246 0 0
Foreign currency losses 1,236,194 14,150 418,710
Loss on remeasurement of investment in Ikanos 557,594 0 0
Change in allowance for bad debt (129,370) (224,644) 154,000
Change in warranty reserves 402,938 379,246 (203,526)
Changes in assets and liabilities:      
Accounts receivable 4,363,447 256,190 1,926,676
Inventory 3,466,568 993,328 (4,171,465)
Prepaid expenses and other current assets 126,580 1,055,482 (718,074)
Accounts payable and accrued expenses (2,996,339) 655,611 338,863
Billings in excess of revenue earned (1,247,066) (743,434) 126,833
Net cash provided by operating activities 3,788,201 19,252,101 13,933,341
Cash flows from investing activities:      
Proceeds from sale of marketable debt securities 37,305,871 40,732,353 47,956,856
Purchase of marketable debt securities (39,853,837) (42,345,935) (48,730,506)
Cash included in current assets held for sale (2,388,812) 0 0
Cash paid to acquire Ikanos, net of cash acquired 93,872 0 0
Cash paid to acquire FDD, net of cash acquired 94,351 (10,084,307) 0
Purchases of cost based investment (2,249,784) (1,980,609) 0
Proceeds from sale of investments 856,170 392,196 4,223,536
Other assets 43,564 16,906 196,578
Capital expenditures (9,831,967) (7,132,371) (15,849,823)
Net cash used in investing activities (15,930,572) (20,401,767) (12,203,359)
Cash flows from financing activities:      
Treasury stock purchases (3,455,529) (4,414,626) (6,728,507)
Investment in KTC as controlling interest was acquired 0 0 (72,085)
Issuance of KTC shares to noncontrolling interest 0 0 111,144
Settlements of restricted stock for tax withholding obligations (628,634) (1,029,567) (531,883)
Proceeds from exercise of stock options 0 72,445 36,244
Net cash used in financing activities (4,084,163) (5,371,748) (7,185,087)
Effect of exchange rate changes on cash 266,758 (217,970) 456,908
Net decrease in cash and equivalents (15,959,776) (6,739,384) (4,998,197)
Cash and equivalents:      
Beginning of year 43,095,163 49,834,547 54,832,744
End of year 27,135,387 43,095,163 49,834,547
Supplemental disclosure of cash flow information:      
Income taxes paid 75,000 186,000 221,000
Supplemental schedule of noncash investing activities:      
Construction in progress included in accrued expenses $ 360,000 $ 469,000 $ 1,194,000