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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
 6 Months Ended
Jun. 30, 2012
Jun. 25, 2011
Cash flows from operating activities:    
Net (loss) income $ (7,592,880) $ 2,802,132
Adjustments to reconcile net (loss) income to net cash provided by operating activities:    
Depreciation and amortization 5,132,790 3,812,998
Amortization of premium or discount on marketable debt securities (142,119) (82,219)
Stock-based compensation 2,223,828 1,470,524
Net gain on sale of investments (856,170) (368,641)
Losses in unconsolidated affiliates 390,202 154,238
Impairment of goodwill 1,704,770  
Deferred income tax asset 581,370  
Foreign currency losses 98,441 575,580
Change in allowance for bad debt (124,976) (360,375)
Change in inventory reserves 547,318 271,636
Change in warranty reserves (300,000)  
Changes in assets and liabilities:    
Accounts receivable 3,061,759 (2,065,893)
Inventory 29,185 2,786,195
Prepaid expenses and other current assets 69,014 210,907
Accounts payable and accrued expenses (3,538,983) (5,069,743)
Billings in excess of revenue earned (50,000) (606,121)
Net cash provided by operating activities 1,233,549 3,531,218
Cash flows from investing activities:    
Proceeds from sale of marketable debt securities 17,579,205 14,997,567
Purchase of marketable debt securities (20,275,585) (19,854,118)
Cash paid to acquire FDD, net of cash acquired 94,351 (10,084,307)
Purchase of investments (2,249,784)  
Proceeds from sale of investments 856,170 392,196
Other assets 73,189 (19,655)
Capital expenditures (5,748,450) (3,865,205)
Net cash used in investing activities (9,670,904) (18,433,522)
Cash flows from financing activities:    
Treasury stock purchases (3,455,529) (1,907,324)
Proceeds from exercise of stock options   72,445
Settlements of restricted stock for tax withholding obligations (96,917) (63,069)
Net cash used in financing activities (3,552,446) (1,897,948)
Effect of exchange rate changes on cash 54,834 136,116
Net decrease in cash and equivalents (11,934,967) (16,664,136)
Cash and equivalents:    
Beginning of period 43,095,163 49,834,547
End of period 31,160,196 33,170,411
Supplemental disclosure of cash flow information:    
Income taxes paid 197,000 139,000
Supplemental schedule of noncash investing activities:    
Construction in progress included in accrued expenses $ 361,000 $ 995,000