Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Current Assets
Cash and cash equivalents	$ 22,615	$ 25,991
Short-term investments	99
Accounts receivable, gross	32,979	30,130
Allowance for doubtful accounts	(708)	(1,020)
Accounts receivable, net	32,271	29,110
Inventories	40,282	36,482
Deferred income taxes	4,161	4,206
Other current assets	7,554	7,954
Total Current Assets	106,982	103,743
Property, plant and equipment, gross	109,227	107,933
Accumulated depreciation	(96,318)	(94,227)
Property, Plant and Equipment, Net	12,909	13,706
Goodwill	15,279	15,279
Intangibles, Net	8,798	9,002
Deferred Income Taxes	10,773	11,115
Other Assets	2,497	2,570
Total Assets	157,238	155,415
Current Liabilities
Accounts payable, accrued expenses and other liabilities	22,058	19,105
Accrued compensation and related taxes	6,997	7,509
Retirement plan obligations	2,452	2,508
Income taxes payable	1,313	712
Total Current Liabilities	32,820	29,834
Long-Term Debt	18,221	21,221
Retirement Plan Obligations	19,258	22,636
Deferred Gain on Sale of Real Estate	1,955	2,216
Other Long-Term Liabilities	482	464
Accrued Warranty Costs	1,386	1,391
Commitments and Contingencies (Note L)
Total Liabilities	74,122	77,762
Shareholders' Equity
Additional paid-in capital	30,518	29,178
Retained earnings	96,717	91,518
Accumulated other comprehensive loss	(18,593)	(18,718)
Treasury stock, at cost	(46,480)	(44,843)
Total Shareholders' Equity	83,116	77,653
Total Liabilities and Shareholders' Equity	157,238	155,415
Class A [Member]
Shareholders' Equity
Common stock	19,149	18,713
Class B [Member]
Shareholders' Equity
Common stock	$ 1,805	$ 1,805