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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 25, 2010
Dec. 26, 2009
Cash flows from operating activities:      
Net income $ 4,259,633 $ 8,955,798 $ 19,270,153
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 8,598,672 6,565,365 5,990,951
Accretion (amortization) of premium or discount on marketable debt securities (152,665) 69,891 (260,687)
Stock-based compensation 3,923,628 2,583,728 1,884,340
Net gain on investment transactions (368,641) (2,597,505)  
Losses (earnings) in unconsolidated affiliates 296,451 600,299 (483,057)
Impairment on marketable debt securities 150,644   926,630
Impairment of intangible assets and goodwill 4,999,512    
Release of valuation allowance on deferred tax assets (4,266,000)    
Gain on loans to KTC     (1,187,937)
Gain on remeasurement of investment in KTC     (599,328)
Foreign currency losses 14,150 418,710 942,462
Change in allowance for bad debt (224,644) 154,000 (588,066)
Change in other non-cash items 379,246 (203,526) 564,252
Changes in assets and liabilities:      
Accounts receivable 256,190 1,926,676 3,703,840
Inventory 162,575 (4,287,717) (2,666,190)
Prepaid expenses and other current assets 1,311,173 (718,074) 132,458
Accounts payable and accrued expenses 655,611 338,863 (4,228,801)
Billings in excess of revenue earned (743,434) 126,833 (43,861)
Net cash provided by operating activities 19,252,101 13,933,341 23,357,159
Cash flows from investing activities:      
Proceeds from sale of marketable debt securities 40,732,353 47,956,856 31,328,136
Purchase of marketable debt securities (42,345,935) (48,730,506) (48,712,270)
Other assets 16,906 196,578 (41,781)
Proceeds from sale of investments 392,196 4,223,536  
Net cash received from KTC equity interest investment     212,380
Cash paid to acquire FDD, net of cash acquired (10,084,307)    
Purchase of cost based investment (1,980,609)    
Proceeds from sale of property and equipment     426,537
Capital expenditures (7,132,371) (15,849,823) (3,684,630)
Net cash used in investing activities (20,401,767) (12,203,359) (20,471,628)
Cash flows from financing activities:      
Treasury stock purchases (4,414,626) (6,728,507) (5,299,451)
Investment in KTC as controlling interest was acquired   (72,085) (300,000)
Issuance of KTC shares to noncontrolling interest   111,144  
Settlements of restricted stock for tax withholding obligations (1,029,567) (531,883) (686,123)
Proceeds from exercise of stock options 72,445 36,244 123,375
Net cash used in financing activities (5,371,749) (7,185,087) (6,162,199)
Effect of exchange rate changes on cash (217,970) 456,908 159,963
Net decrease in cash and equivalents (6,739,384) (4,998,197) (3,116,705)
Cash and equivalents:      
Beginning of year 49,834,547 54,832,744 57,949,449
End of year 43,095,163 49,834,547 54,832,744
Supplemental disclosure of cash flow information:      
Income taxes paid 186,000 221,000 1,304,000
Supplemental schedule of noncash investing activities:      
Construction in progress included in accrued expenses $ 469,000 $ 1,194,000 $ 124,058