Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Jan. 01, 2011	Jan. 02, 2010
CASH PROVIDED BY (USED IN) Operating Activities:
Net Income	$ 8,310	$ 6,208	$ 1,559
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	5,280	5,404	4,841
Amortization	739	1,211	1,032
Restructuring charges			1,860
Restructuring charges paid		(771)	(1,926)
Amortization of deferred gain	(521)	(522)	(521)
Provision for bad debts	68	139	691
Deferred income taxes	2,989	501	(1,617)
Provision for accrued warranty costs	285	797	705
Warranty costs paid	(391)	(735)	(592)
Stock-based compensation and directors' fees	1,892	2,170	820
Excess tax (benefit) provision from stock-based awards	(830)	70	139
Unrealized (gain) loss on short-term investments		(29)	268
Unrealized (gain) loss on foreign exchange contracts	(24)	154	(503)
Increase (decrease) in non-income based tax reserves	178	(193)	(338)
Unrealized foreign currency transaction (gain) loss	(227)	84	(73)
Changes in operating assets and liabilities:
Accounts receivable	728	1	151
Inventories	(1,864)	(5,780)	2,114
Other assets	(2,712)	(438)	3,633
Accounts payable	497	1,317	1,380
Other liabilities	(4,100)	3,208	(2,101)
Net Cash Provided by Operating Activities	10,297	12,796	11,522
Investing Activities:
Acquisition of Native Eyewear, Inc., net of cash acquired			(481)
Purchases of short-term investments	(31,525)	(17,040)	(40,192)
Sales of short-term investments	34,039	21,772	33,900
Additions to property, plant and equipment	(3,912)	(4,533)	(5,149)
Additions to trademarks and patents	(283)	(286)	(288)
Net Cash Used in Investing Activities	(1,681)	(87)	(12,210)
Financing Activities:
Excess tax benefit (provision) from stock-based awards	830	(70)	(139)
Borrowing on long-term debt agreement	16,300	5,860
Repayment of long-term debt	(14,300)	(6,360)	(2,000)
Proceeds from sale of Class A common stock	170	18	16
Repurchase of share-based awards to satisfy tax withholdings	(430)	(76)
Purchase of treasury stock	(1,619)	(267)	(678)
Purchase of treasury stock from related party		(5,612)	(5,182)
Net Cash Provided by (Used in) Financing Activities	951	(6,507)	(7,983)
Effect of exchange rate changes on cash and cash equivalents	(226)	5	485
Increase (Decrease) in Cash and Cash Equivalents	9,341	6,207	(8,186)
Cash and cash equivalents at beginning of period	16,650	10,443	18,629
Cash and Cash Equivalents at End of Period	25,991	16,650	10,443
SUPPLEMENTAL INFORMATION
Income taxes paid (refunded), net	1,159	(609)	(3,152)
Interest paid	$ 701	$ 974	$ 1,249