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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
 9 Months Ended
Sep. 28, 2013
Sep. 29, 2012
Cash flows from operating activities:    
Net (loss) income $ 4,237,859 $ (14,660,776)
Adjustments to reconcile net (loss) income to net cash provided by operating activities:    
Depreciation and amortization 3,058,056 7,634,175
Amortization of premium or discount on marketable debt securities 211,821 (222,658)
Stock-based compensation 3,648,904 3,773,306
Net gain on investment transactions (1,899,291) (856,170)
Loss in unconsolidated affiliate 408,194 592,480
Impairment of cost based investment 2,485,393 0
Impairment of goodwill 0 1,704,770
Gain from sale of III-V product line (33,452,176) 0
Deferred income taxes 348,700 729,190
Foreign currency (gains) losses 154,138 595,016
Loss on remeasurement of investment in Ikanos 0 557,594
Change in allowance for bad debt 6,535 (85,038)
Other non-cash items 864,233 668,320
Change in warranty reserves 0 (300,000)
Changes in assets and liabilities:    
Accounts receivable 4,285,421 3,150,525
Inventory 2,357,892 297,273
Prepaid expenses and other current assets (24,697) 168,068
Accounts payable and accrued expenses (92,694) (1,998,170)
Billings in excess of revenue earned 561,773 (252,572)
Net cash (used in) provided by operating activities (12,839,939) 1,495,333
Cash flows from investing activities:    
Proceeds from sale of marketable debt securities 14,100,760 33,315,471
Purchase of marketable debt securities (47,319,491) (39,706,955)
Proceeds from sale of III-V product line 55,188,020 0
Cash paid to acquire Ikanos, net of cash acquired 0 93,872
Cash paid to acquire eMDT, net of cash acquired (211,484) 0
Cash paid to acquire FDD, net of cash acquired 0 94,351
Purchases of cost based investments (3,450,278) (2,249,784)
Proceeds from sale of investments 2,597,289 856,170
Other assets (81,804) 77,383
Capital expenditures (519,323) (8,464,076)
Net cash provided by (used in) investing activities 20,726,657 (15,983,568)
Net cash used in financing activities    
Treasury stock purchases (5,986,821) (3,455,529)
Purchase of noncontrolling interest in Kowon (3,662,400) 0
Settlement of restricted stock for tax withholding obligations (11,449) (100,676)
Net cash used in financing activities (9,660,670) (3,556,205)
Effect of exchange rate changes on cash (71,042) 212,516
Net decrease in cash and equivalents (1,844,994) (17,831,924)
Cash and equivalents:    
Beginning of period 27,135,387  
End of period 25,290,393 25,263,239
Supplemental disclosure of cash flow information:    
Income taxes paid 0 197,000
Supplemental schedule of noncash investing activities:    
Construction in progress included in accrued expenses 174,600 0
Non-cash proceeds from sale of III-V product line $ 14,866,000