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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	9 Months Ended
	Sep. 24, 2011	Sep. 25, 2010
Cash flows from operating activities:
Net income	$ 3,852,899	$ 4,332,574
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	5,996,918	5,066,031
Accretion of discount on marketable debt securities	(110,162)	82,861
Stock-based compensation	2,176,820	1,889,780
Equity loss in unconsolidated affiliate	203,834	369,649
Foreign currency (gains) losses	(326,465)	228,176
Impairment of marketable debt securities	150,644
Gain on sale of investments	(368,641)	(2,597,505)
Change in allowance for bad debt	(107,726)
Change in inventory reserves	408,900	558,270
Changes in assets and liabilities:
Accounts receivable	1,358,326	(1,091,429)
Inventory	2,156,398	(2,739,105)
Prepaid expenses and other current assets	721,068	(848,343)
Accounts payable, accrued expenses and other accrued liabilities	(4,248,968)	1,143,129
Billings in excess of revenue earned	(747,914)	(591,816)
Net cash provided by operating activities	11,115,931	5,802,272
Cash flows from investing activities:
Proceeds from sale and maturity of marketable debt securities	36,872,779	38,225,256
Purchase of marketable debt securities	(38,976,135)	(40,903,342)
Proceeds from sale of investments	392,196	4,223,536
Investment in Forth Dimension Displays, net of cash acquired	(10,084,307)
Other assets	32,919	152,977
Capital expenditures	(5,730,749)	(9,692,829)
Net cash used in investing activities	(17,493,297)	(7,994,402)
Cash flows from financing activities:
Treasury stock purchases	(3,060,156)	(5,389,981)
Proceeds from exercise of stock options	72,445	30,619
Settlements of restricted stock for tax withholding obligations	(72,374)	(104,018)
Net cash used in financing activities	(3,060,085)	(5,463,380)
Effect of exchange rate changes on cash	(233,754)	156,988
Net decrease in cash and equivalents	(9,671,205)	(7,498,522)
Cash and equivalents:
Beginning of period	49,834,547	54,832,744
End of period	40,163,342	47,334,222
Supplemental disclosure of cash flow information:
Income taxes paid	163,000	210,000
Supplemental schedule of noncash investing activities:
Construction in progress included in accrued expenses	$ 526,000	$ 770,000

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