Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 30, 2013	Dec. 29, 2012
Current Assets
Cash and cash equivalents	$ 12,630	$ 27,120
Short-term investments	271	227
Accounts receivable, gross	34,741	33,510
Allowance for doubtful accounts	(635)	(633)
Accounts receivable, net	34,106	32,877
Inventories	42,391	38,020
Deferred income taxes	3,409	3,417
Other current assets	8,933	8,072
Total Current Assets	101,740	109,733
Property, plant and equipment, gross	113,439	112,901
Accumulated depreciation	(99,475)	(98,525)
Property, Plant and Equipment, Net	13,964	14,376
Goodwill	15,279	15,279
Intangibles, Net	8,523	8,606
Deferred Income Taxes	10,994	11,570
Other Assets	1,785	1,775
Total Assets	152,285	161,339
Current Liabilities
Accounts payable, accrued expenses and other liabilities	19,303	26,399
Line of credit	15,000	15,000
Accrued compensation and related taxes	5,847	8,132
Retirement plan obligations	2,577	2,731
Income taxes payable	178	567
Total Current Liabilities	42,905	52,829
Retirement Plan Obligations	19,737	19,808
Deferred Gain on Sale of Real Estate	1,564	1,695
Other Long-Term Liabilities	706	662
Accrued Warranty Costs	1,256	1,267
Commitments and Contingencies (Note L)
Total Liabilities	66,168	76,261
Shareholders' Equity
Additional paid-in capital	33,249	32,309
Retained earnings	102,306	100,666
Accumulated other comprehensive loss	(20,536)	(19,852)
Treasury stock, at cost	(49,915)	(49,027)
Total Shareholders' Equity	86,117	85,078
Total Liabilities and Shareholders' Equity	152,285	161,339
Class A [Member]
Shareholders' Equity
Common stock	19,208	19,177
Class B [Member]
Shareholders' Equity
Common stock	$ 1,805	$ 1,805