Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011
Cash Provided By (Used in) Operating Activities:
Net Income	$ 9,148	$ 8,310	$ 6,208
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	4,982	5,280	5,404
Amortization	735	739	1,211
Restructuring charges paid			(771)
Amortization of deferred gain	(521)	(521)	(522)
Provision for bad debts	(206)	68	139
Deferred income taxes	1,326	2,989	501
Stock-based compensation and directors' fees	2,436	1,892	2,170
Excess tax (benefit) provision from stock-based awards	(653)	(830)	70
Unrealized gain on short-term investments	(9)		(29)
Unrealized (gain) loss on foreign exchange contracts	(100)	(24)	154
Unrealized foreign currency transaction (gain) loss	(403)	(227)	84
Changes in operating assets and liabilities:
Accounts receivable	(3,635)	728	1
Inventories	(1,475)	(1,864)	(5,780)
Other assets	946	(2,712)	(438)
Accounts payable	6,813	497	1,317
Other liabilities	(2,439)	(4,028)	3,077
Net Cash Provided by Operating Activities	16,945	10,297	12,796
Cash (Used in) Provided by Investing Activities:
Purchases of short-term investments	(44,279)	(31,525)	(17,040)
Sales of short-term investments	44,061	34,039	21,772
Additions to property, plant and equipment	(5,635)	(3,912)	(4,533)
Additions to trademarks and patents	(339)	(283)	(286)
Net Cash Used in Investing Activities	(6,192)	(1,681)	(87)
Cash (Used in) Provided by Financing Activities:
Excess tax benefit (provision) from stock-based awards	653	830	(70)
Borrowing on line of credit	3,000	16,300	5,860
Repayment of line of credit	(9,221)	(14,300)	(6,360)
Proceeds from sale of Class A common stock, net	463	170	18
Repurchase of share-based awards to satisfy tax withholdings	(119)	(430)	(76)
Purchase of treasury stock	(4,022)	(1,619)	(267)
Purchase of treasury stock from related party			(5,612)
Net Cash (Used in) Provided by Financing Activities	(9,246)	951	(6,507)
Effect of exchange rate changes on cash and cash equivalents	(378)	(226)	5
Increase in Cash and Cash Equivalents	1,129	9,341	6,207
Cash and cash equivalents at beginning of period	25,991	16,650	10,443
Cash and Cash Equivalents at End of Period	27,120	25,991	16,650
SUPPLEMENTAL INFORMATION
Income taxes paid (refunded), net	1,702	1,159	(609)
Interest paid	$ 491	$ 701	$ 974