CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
CONSOLIDATED STATEMENTS OF CASH FLOWS [Abstract]
Net earnings (loss)	$ 3,764	$ 13,649	$ (8,310)
Adjustments to reconcile net earnings (loss) to net cash provided by operating activities:
Depreciation and amortization	8,667	8,836	6,778
Stock-based compensation	1,709	2,200	1,731
Gain on disposal/sale of property, plant and equipment	(93)	(352)	(4,693)
Realized gain on sale of investments	(119)	0	(7,129)
Impairment of assets	0	0	12,875
Other, net	1,114	715	807
Deferred income taxes	683	725	4,004
Changes in operating assets and liabilities	14,542	(18,136)	23,095
Net Cash Provided by Operating Activities	30,267	7,637	29,158
Cash flows from investing activities:
Purchase of property, plant and equipment	(2,928)	(2,427)	(2,357)
Purchase of marketable securities	(5,135)	(6,190)	(3,545)
(Purchase of) proceeds from surrender of company-owned life insurance, net	(2,406)	3,428	1,518
Cash transferred (to) from restricted cash	(12,830)	250	(250)
Payment for acquisition, net of cash aquired	0	(40,424)	(454)
Purchase of intangible asset	0	0	(99)
Proceeds from sale of marketable securities	433	0	20,592
Proceeds from disposal/sale of property, plant and equipment	386	606	2,639
Redemption of investment	0	0	5,286
Net Cash (Used In) Provided by Investing Activities	(22,480)	(44,757)	23,330
Cash flows from financing activities:
Dividends paid to common shareholders	(3,205)	(3,181)	(3,137)
Purchase and retirement of Class A common stock	0	0	(92)
Net Cash Used In Financing Activities	(3,205)	(3,181)	(3,229)
Effect of exchange rate changes on cash	(170)	(101)	17
Net Increase (Decrease) in Cash and Cash Equivalents	4,412	(40,402)	49,276
Cash and Cash Equivalents - beginning of year	83,829	124,231	74,955
Cash and Cash Equivalents - end of year	88,241	83,829	124,231
Changes in operating assets and liabilities consist of:
Decrease (increase) in accounts receivable	14,172	(12,164)	11,297
Decrease (increase) in inventories	3,561	(17,648)	14,763
Increase in prepaid expenses and other current assets	(1,746)	(833)	(92)
(Increase) decrease in other assets	(140)	(13)	76
(Decrease) increase in accounts payable	(2,683)	1,716	2,905
Increase (decrease) in income taxes payable	1,384	(1,157)	(3,510)
Decrease in accrued restructuring costs	(507)	(157)	(297)
Increase (decrease) in accrued expenses	501	12,120	(2,047)
Changes in operating assets and liabilities	14,542	(18,136)	23,095
Cash paid during the year for:
Income taxes, net of refunds received	1,947	2,172	(1,909)
Interest	0	15	2
Details of acquisition (see Note 3):
Fair value of identifiable net assets acquired	0	38,132	25
Goodwill	0	2,349	468
Fair value of net assets acquired	0	40,481	493
Fair value of consideration transferred	0	40,481	493
Less: Cash acquired in acquisition	0	(57)	0
Amount held back on acquisition payment	0	0	(39)
Cash paid for acquisition, net of cash acquired	$ 0	$ 40,424	$ 454