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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
 3 Months Ended
Mar. 30, 2013
Mar. 31, 2012
Cash flows from operating activities:    
Net (loss) income $ 21,364,390 $ (2,466,491)
Adjustments to reconcile net (loss) income to net cash provided by operating activities:    
Depreciation and amortization 1,095,202 2,526,918
Amortization of premium or discount on marketable debt securities (29,025) (82,424)
Stock-based compensation 1,505,832 1,084,057
Net gain on sale of investments 0 (856,170)
Losses in unconsolidated affiliates 99,088 156,295
Impairment on investments 2,485,393 0
Proceeds received from divestiture (33,452,176)  
Impairment of goodwill   0
Deferred income tax asset 40,700 281,226
Foreign currency losses (201,532) 198,344
Change in allowance for bad debt (18,508) (67,758)
Change in inventory reserves 189,224 350,770
Changes in assets and liabilities:    
Accounts receivable 3,595,929 2,587,333
Inventory 1,100,241 (1,270,343)
Prepaid expenses and other current assets 288,901 75,591
Accounts payable and accrued expenses (1,177,857) (3,124,717)
Billings in excess of revenue earned (155,476) (21,634)
Net cash provided by operating activities (3,269,674) (629,003)
Cash flows from investing activities:    
Proceeds from sale of marketable debt securities 6,604,744 14,446,777
Purchase of marketable debt securities (39,720,697) (10,440,958)
Cash paid to acquire Ikanos, net of cash acquired 0 (1,249,784)
Cash paid to acquire FDD, net of cash acquired 0 94,351
Purchase of investments (2,750,278) 0
Proceeds from sale of investments 0 856,170
Other assets 0 111,739
Capital expenditures (307,930) (1,775,988)
Net cash used in investing activities 18,825,839 2,042,307
Proceeds from Divestiture of Businesses, Net of Cash Divested 55,000,000 0
Cash flows from financing activities:    
Treasury stock purchases 0 (1,272,037)
Noncontrolling Interest, Increase from Equity Issuance or Sale of Parent Equity Interest (3,662,400)  
Settlements of restricted stock for tax withholding obligations (11,449) 0
Net cash used in financing activities (3,673,849) (1,272,037)
Effect of exchange rate changes on cash (165,767) 155,389
Net decrease in cash and equivalents 11,716,549 296,656
Cash and equivalents:    
Beginning of period 27,135,387  
End of period 38,851,936 43,391,619
Supplemental disclosure of cash flow information:    
Income taxes paid 113,700 163,000
Supplemental schedule of noncash investing activities:    
Construction in progress included in accrued expenses $ 0 $ 526,000