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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
 6 Months Ended
Jun. 29, 2013
Jun. 30, 2012
Cash flows from operating activities:    
Net (loss) income $ 13,253,052 $ (7,592,880)
Adjustments to reconcile net (loss) income to net cash provided by operating activities:    
Depreciation and amortization 2,135,458 5,132,790
Amortization of premium or discount on marketable debt securities (66,181) (142,119)
Stock-based compensation 2,419,528 2,223,828
Net gain on sale of investments 0 (856,170)
Losses in unconsolidated affiliates 182,785 390,202
Other than Temporary Impairment Losses, Investments 2,485,393 0
Impairment of goodwill 0 1,704,770
Proceeds received from divestiture (33,452,176) 0
Deferred income tax asset 300,700 581,370
Foreign currency losses (596,213) 98,441
Change in allowance for bad debt (56,072) (124,976)
Change in inventory reserves 807,964 547,318
Other Noncash Income (Expense) 0 (300,000)
Changes in assets and liabilities:    
Accounts receivable 4,349,611 3,061,759
Inventory 1,569,883 29,185
Prepaid expenses and other current assets (232,787) 69,014
Accounts payable and accrued expenses (1,005,477) (3,538,983)
Billings in excess of revenue earned 710,455 (50,000)
Net cash provided by operating activities (7,194,077) 1,233,549
Proceeds from Sales of Business, Affiliate and Productive Assets (4,253,680)  
Cash flows from investing activities:    
Proceeds from sale of marketable debt securities 12,201,313 17,579,205
Purchase of marketable debt securities (45,321,366) (20,275,585)
Proceeds from Divestiture of Businesses, Net of Cash Divested 55,188,020 0
Noncontrolling Interest, Increase from Equity Issuance or Sale of Parent Equity Interest (3,662,400) 0
Cash paid to acquire Ikanos, net of cash acquired 211,484 0
Cash paid to acquire FDD, net of cash acquired 0 94,351
Purchase of investments (2,750,278) (2,249,784)
Proceeds from sale of investments 0 856,170
Other assets (8,681) 73,189
Capital expenditures (513,780) (5,748,450)
Net cash used in investing activities 19,006,712 (9,670,904)
Cash flows from financing activities:    
Treasury stock purchases (2,230,843) (3,455,529)
Settlements of restricted stock for tax withholding obligations (11,449) (96,917)
Net cash used in financing activities (5,904,692) (3,552,446)
Effect of exchange rate changes on cash (243,778) 54,834
Net decrease in cash and equivalents 5,664,165 (11,934,967)
Cash and equivalents:    
Beginning of period 27,135,387  
End of period 32,799,552 31,160,196
Supplemental disclosure of cash flow information:    
Income taxes paid 113,700 197,000
Supplemental schedule of noncash investing activities:    
Construction in progress included in accrued expenses 0 361,000
Notes Receivable, Fair Value Disclosure $ 14,833,000