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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
 3 Months Ended
Mar. 31, 2012
Mar. 26, 2011
Cash flows from operating activities:    
Net (loss) income $ (2,057,631) $ 2,044,180
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 2,526,918 1,927,031
Accretion (amortization) of premium or discount on marketable debt securities (82,424) (28,240)
Stock-based compensation 1,084,057 559,133
Net gain on sale of investments (856,170)  
Loss in unconsolidated affiliate 156,295 110,639
Deferred income tax asset 281,226  
Foreign currency losses 198,344 290,959
Change in allowance for bad debt (67,758) (330,900)
Change in other non-cash items 350,770 384,533
Changes in assets and liabilities:    
Accounts receivable 2,587,333 (579,635)
Inventory (1,831,265) 75,026
Prepaid expenses and other current assets 227,453 1,165,219
Accounts payable and accrued expenses (3,124,717) (4,985,822)
Billings in excess of revenue earned (21,634) (132,929)
Net cash (used in) provided by operating activities (629,203) 499,194
Cash flows from investing activities:    
Proceeds from sale of marketable debt securities 14,446,777 5,044,286
Purchase of marketable debt securities (10,440,958) (5,195,053)
Cash paid to acquire FDD, net of cash acquired 94,351 (9,999,395)
Purchase of investments (1,249,784)  
Proceeds from sale of investments 856,170  
Other assets 111,739 (394,313)
Capital expenditures (1,775,988) (1,182,116)
Net cash provided by (used in) investing activities 2,042,307 (11,726,591)
Cash flows from financing activities:    
Treasury stock purchases (1,272,037) (567,645)
Proceeds from exercise of stock options   10,500
Settlements of restricted stock for tax withholding obligations   (58,418)
Net cash used in financing activities (1,272,037) (615,563)
Effect of exchange rate changes on cash 155,389 2,052
Net increase (decrease) in cash and equivalents 296,456 (11,840,908)
Cash and equivalents:    
Beginning of period 43,095,163 49,834,547
End of period 43,391,619 37,993,639
Supplemental disclosure of cash flow information:    
Income taxes paid 197,000 122,000
Supplemental schedule of noncash investing activities:    
Construction in progress included in accrued expenses $ 1,681,000 $ 1,019,000