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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
 6 Months Ended
Jun. 28, 2014
Jun. 29, 2013
Cash flows from operating activities:    
Net (loss) income $ (18,121,235) $ 13,253,052
Adjustments to reconcile net (loss) income to net cash provided by operating activities:    
Depreciation and amortization 1,779,594 2,135,458
Amortization of premium or discount on marketable debt securities 36,841 (66,181)
Stock-based compensation 2,362,446 2,419,528
Loss in unconsolidated affiliate 102,305 182,785
Asset Impairment Charges 1,319,287 2,485,393
Gain from sale of III-V product line 0 (33,452,176)
Deferred income taxes (95,262) 300,700
Foreign currency gains (losses) 507,792 (596,213)
Gain (Loss) on Disposition of Property Plant Equipment (250,000) 0
Change in allowance for bad debt 14,679 (56,072)
Other non-cash items 314,335 807,964
Changes in assets and liabilities:    
Accounts receivable (1,018,638) 4,349,611
Inventory (518,105) 1,569,883
Prepaid expenses and other current assets (81,989) (232,787)
Accounts payable and accrued expenses 865,328 (1,005,477)
Billings in excess of revenue earned (258,189) 710,455
Net cash used in operating activities (13,040,811) (7,194,077)
Cash flows from investing activities:    
Proceeds from sale of marketable debt securities 23,861,627 12,201,313
Purchase of marketable debt securities (13,106,060) (45,321,366)
Proceeds from sale of III-V product line 0 55,188,020
Payments to Acquire Business Two, Net of Cash Acquired 0 211,484
Purchases of cost based investments 0 (2,750,278)
Other assets (36,455) (8,681)
Capital expenditures (978,037) (513,780)
Net cash provided by investing activities 9,741,075 19,006,712
Net cash used in financing activities    
Treasury stock purchases (298,619) (2,230,843)
Purchase of noncontrolling interest in Kowon 0 (3,662,400)
Proceeds from exercise of stock options 128,441 0
Settlement of restricted stock for tax withholding obligations 0 (11,449)
Net cash used in financing activities (170,178) (5,904,692)
Effect of exchange rate changes on cash 18,575 (243,778)
Net (decrease) increase in cash and equivalents (3,451,339) 5,664,165
Cash and equivalents:    
Beginning of period 16,756,666  
End of period 13,305,327  
Supplemental disclosure of cash flow information:    
Income taxes paid 70,300 113,700
Supplemental schedule of noncash investing activities:    
Construction in progress included in accrued expenses 156,000 0
Non-cash proceeds from sale of III-V product line $ 0