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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
 9 Months Ended
Sep. 27, 2014
Sep. 28, 2013
Cash flows from operating activities:    
Net (loss) income $ (23,225,143) $ 4,237,859
Adjustments to reconcile net (loss) income to net cash provided by operating activities:    
Depreciation and amortization 2,587,551 3,058,056
Amortization of premium or discount on marketable debt securities 60,544 211,821
Stock-based compensation 3,555,454 3,648,904
Gain (Loss) on Sale of Investments 0 (1,899,291)
Payments to Acquire Interest in Subsidiaries and Affiliates 102,305 408,194
Asset Impairment Charges 1,319,287 2,485,393
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property (250,000) 0
Gain from sale of III-V product line 0 (33,452,176)
Deferred income taxes (102,995) 348,700
Foreign currency losses 229,430 154,138
Change in allowance for bad debt 94,019 6,535
Other non-cash items 245,599 864,233
Changes in assets and liabilities:    
Accounts receivable (1,129,914) 4,285,421
Inventory (1,096,976) 2,357,892
Prepaid expenses and other current assets (217,941) (24,697)
Accounts payable and accrued expenses 641,685 (92,694)
Billings in excess of revenue earned (202,185) 561,773
Net cash used in operating activities (17,389,280) (12,839,939)
Cash flows from investing activities:    
Other assets (47,456) (81,804)
Capital expenditures (1,544,056) (519,323)
Proceeds from sale of marketable debt securities 33,386,147 14,100,760
Purchase of marketable debt securities (14,130,888) (47,319,491)
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 (3,450,278)
Proceeds from Sale and Maturity of Other Investments 0 2,597,289
Proceeds from Sale of Machinery and Equipment 250,000 0
Net cash provided by investing activities 17,913,747 20,726,657
Net cash used in financing activities    
Treasury stock purchases (298,619) (5,986,821)
Purchase of noncontrolling interest in Kowon 0 (3,662,400)
Proceeds from exercise of stock options 137,813 0
Settlement of restricted stock for tax withholding obligations (56,286) (11,449)
Net cash used in financing activities (217,092) (9,660,670)
Effect of exchange rate changes on cash (14,958) (71,042)
Net increase (decrease) in cash and equivalents 292,417 (1,844,994)
Cash and equivalents:    
Beginning of period 16,756,666 27,135,387
End of period 17,049,083 25,290,393
Supplemental disclosure of cash flow information:    
Income taxes paid 70,300 0
Supplemental schedule of noncash investing activities:    
Construction in progress included in accrued expenses 169,500 174,600
Non-cash proceeds from sale of III-V product line $ 0