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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
 12 Months Ended
Dec. 28, 2013
Dec. 29, 2012
Dec. 31, 2011
Cash flows from operating activities:      
Net (loss) income $ (5,606,016) $ (18,994,272) $ 3,684,571
Adjustments to reconcile net (loss) income to net cash (used in) provided by operating activities:      
Depreciation and amortization 3,646,725 9,111,943 8,598,672
Accretion (amortization) of premium or discount on marketable debt securities 360,403 (287,439) (152,665)
Stock-based compensation 4,203,408 4,486,990 3,923,628
Net gain on investment transactions (1,899,291) (856,170) (368,641)
Losses in unconsolidated affiliates 625,098 679,587 296,451
Impairment on marketable debt securities 0 0 150,644
Goodwill and Intangible Asset Impairment 1,511,414 1,704,770 4,999,512
Gain (Loss) on Sale of Business (33,452,176)    
Release of valuation allowance on deferred tax assets 0 0 (4,266,000)
Deferred income taxes 252,687 2,162,246 0
Foreign currency losses 341,590 1,236,194 14,150
Loss on remeasurement of investment in Ikanos 0 557,594 0
Asset Impairment Charges 5,000,442 0 0
Change in allowance for bad debt (107,694) (129,370) (224,644)
Change in warranty reserves 733,428 402,938 379,246
Changes in assets and liabilities:      
Accounts receivable 4,853,073 4,363,447 256,190
Inventory 2,262,547 3,466,568 993,328
Prepaid expenses and other current assets (179,858) 126,580 1,055,482
Accounts payable and accrued expenses (773,471) (2,996,339) 655,611
Billings in excess of revenue earned (672,714) (1,247,066) (743,434)
Net cash (used in) provided by operating activities (18,900,405) 3,788,201 19,252,101
Cash flows from investing activities:      
Proceeds from sale of marketable debt securities 17,130,488 37,305,871 40,732,353
Purchase of marketable debt securities (49,329,891) (39,853,837) (42,345,935)
Proceeds from Divestiture of Businesses, Net of Cash Divested 55,188,020    
Cash included in current assets held for sale 0 (2,388,812) 0
Cash paid to acquire Ikanos, net of cash acquired 0 93,872 0
Payments to Acquire Business Three, Net of Cash Acquired 211,484    
Cash paid to acquire FDD, net of cash acquired 0 94,351 (10,084,307)
Purchases of cost based investment (3,583,611) (2,249,784) (1,980,609)
Proceeds from sale of investments 2,597,289 856,170 392,196
Other assets (10,552) 43,564 16,906
Capital expenditures (741,543) (9,831,967) (7,132,371)
Net cash provided by (used in) investing activities 21,461,684 (15,930,572) (20,401,767)
Cash flows from financing activities:      
Treasury stock purchases (7,991,954) (3,455,529) (4,414,626)
Purchase of noncontrolling interest in Kowon (3,662,400) 0 0
Settlements of restricted stock for tax withholding obligations (1,192,346) (628,634) (1,029,567)
Proceeds from exercise of stock options 0 0 72,445
Net cash used in financing activities (12,846,700) (4,084,163) (5,371,748)
Effect of exchange rate changes on cash (93,300) 266,758 (217,970)
Net decrease in cash and equivalents (10,378,721) (15,959,776) (6,739,384)
Cash and equivalents:      
Beginning of year 27,135,387 43,095,163  
End of year 16,756,666 27,135,387 43,095,163
Supplemental disclosure of cash flow information:      
Income taxes paid 95,000 75,000 186,000
Supplemental schedule of noncash investing activities:      
Construction in progress included in accrued expenses 105,000 360,000 469,000
Notes Receivable, Fair Value Disclosure $ 14,866,000