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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
 3 Months Ended
Mar. 29, 2014
Mar. 30, 2013
Cash flows from operating activities:    
Net (loss) income $ (9,093,319) $ 21,364,390
Adjustments to reconcile net (loss) income to net cash provided by operating activities:    
Depreciation and amortization 932,974 1,095,202
Amortization of premium or discount on marketable debt securities 17,300 (29,025)
Stock-based compensation 1,126,957 1,505,832
Loss in unconsolidated affiliate 102,305 99,088
Remeasurement Gain (Loss) On Previously Held Equity Interest In Acquiree 0 2,485,393
Gain from sale of III-V product line 0 (33,452,176)
Deferred income taxes (122,359) 40,700
Foreign currency gains (157,642) (201,532)
Change in allowance for bad debt 14,679 (18,508)
Other non-cash items 233,078 189,224
Changes in assets and liabilities:    
Accounts receivable 122,945 3,595,929
Inventory 487,156 1,100,241
Prepaid expenses and other current assets 578,444 288,901
Accounts payable and accrued expenses (504,810) (1,177,857)
Billings in excess of revenue earned 117,491 (155,476)
Net cash used in operating activities (6,144,801) (3,269,674)
Cash flows from investing activities:    
Proceeds from sale of marketable debt securities 13,267,391 6,604,744
Purchase of marketable debt securities (8,444,398) (39,720,697)
Proceeds from sale of III-V product line 0 55,000,000
Purchases of cost based investments 0 (2,750,278)
Other assets (14,127) 0
Capital expenditures (444,372) (307,930)
Net cash provided by investing activities 4,364,494 18,825,839
Net cash used in financing activities    
Treasury stock purchases (298,619) 0
Purchase of noncontrolling interest in Kowon 0 (3,662,400)
Proceeds from Stock Options Exercised 128,441  
Settlement of restricted stock for tax withholding obligations 0 (11,449)
Net cash used in financing activities (170,178) (3,673,849)
Effect of exchange rate changes on cash 5,429 (165,767)
Net (decrease) increase in cash and equivalents (1,945,056) 11,716,549
Cash and equivalents:    
Beginning of period 16,756,666  
End of period 14,811,610 38,851,936
Supplemental disclosure of cash flow information:    
Income taxes paid 57,100 113,700
Supplemental schedule of noncash investing activities:    
Construction in progress included in accrued expenses 232,000 0
Non-cash proceeds from sale of III-V product line $ 0 $ 14,800,000