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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
 6 Months Ended
Jun. 25, 2011
Jun. 26, 2010
Cash flows from operating activities:    
Net income $ 2,802,132 $ 3,060,786
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 3,812,998 3,697,463
Accretion of discount on marketable debt securities (82,219) (84,112)
Stock-based compensation 1,470,524 1,174,094
Equity loss in unconsolidated affiliate 154,238 182,586
Foreign currency losses 575,580 366,374
Gain on sale of investments (368,641) (2,597,505)
Change in allowance for bad debt (360,375)  
Change in inventory reserves 271,636 268,750
Changes in assets and liabilities:    
Accounts receivable (2,065,893) (1,594,190)
Inventory 2,786,195 (1,388,326)
Prepaid expenses and other current assets 210,907 (1,352,014)
Accounts payable, accrued expenses and other accrued liabilities (5,069,743) (109,215)
Billings in excess of revenue earned (606,121) (487,030)
Net cash provided by operating activities 3,531,218 1,137,661
Cash flows from investing activities:    
Proceeds from sale and maturity of marketable debt securities 14,997,567 24,168,590
Purchase of marketable debt securities (19,854,118) (36,837,378)
Proceeds from sale of investments 392,196 4,223,536
Investment in Forth Dimension Displays, net of cash acquired (10,084,307)  
Other assets (19,655) 28,533
Capital expenditures (3,865,205) (4,316,868)
Net cash used in investing activities (18,433,522) (12,733,587)
Cash flows from financing activities:    
Treasury stock purchases (1,907,324)  
Proceeds from exercise of stock options 72,445 30,619
Settlements of restricted stock for tax withholding obligations (63,069) (103,433)
Net cash used in financing activities (1,897,948) (72,814)
Effect of exchange rate changes on cash 136,116 7,210
Net decrease in cash and equivalents (16,664,136) (11,661,530)
Cash and equivalents:    
Beginning of period 49,834,547 54,832,744
End of period 33,170,411 43,171,214
Supplemental disclosure of cash flow information:    
Income taxes paid 139,000 200,000
Supplemental schedule of noncash investing activities:    
Construction in progress included in accrued expenses $ 995,000 $ 464,000