Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 29, 2012	Dec. 31, 2011
Current Assets
Cash and cash equivalents	$ 20,599	$ 25,991
Short-term investments	226
Accounts receivable, gross	30,343	30,130
Allowance for doubtful accounts	(693)	(1,020)
Accounts receivable, net	29,650	29,110
Inventories	39,449	36,482
Deferred income taxes	5,978	4,206
Other current assets	5,914	7,954
Total Current Assets	101,816	103,743
Property, plant and equipment, gross	111,812	107,933
Accumulated depreciation	(97,647)	(94,227)
Property, Plant and Equipment, Net	14,165	13,706
Goodwill	15,279	15,279
Intangibles, Net	8,713	9,002
Deferred Income Taxes	11,325	11,115
Other Assets	1,854	2,570
Total Assets	153,152	155,415
Current Liabilities
Accounts payable, accrued expenses and other liabilities	19,010	19,105
Line of credit	17,000
Accrued compensation and related taxes	6,464	7,509
Retirement plan obligations	2,600	2,508
Income taxes payable	1,299	712
Total Current Liabilities	46,373	29,834
Line of Credit		21,221
Retirement Plan Obligations	17,974	22,636
Deferred Gain on Sale of Real Estate	1,825	2,216
Other Long-Term Liabilities	469	464
Accrued Warranty Costs	1,347	1,391
Commitments and Contingencies (Note L)
Total Liabilities	67,988	77,762
Shareholders' Equity
Additional paid-in capital	30,899	29,178
Retained earnings	98,756	91,518
Accumulated other comprehensive loss	(18,289)	(18,718)
Treasury stock, at cost	(47,176)	(44,843)
Total Shareholders' Equity	85,164	77,653
Total Liabilities and Shareholders' Equity	153,152	155,415
Class A [Member]
Shareholders' Equity
Common stock	19,169	18,713
Class B [Member]
Shareholders' Equity
Common stock	$ 1,805	$ 1,805