CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS [Abstract]
Net earnings	$ 876	$ 3,244
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	2,105	2,130
Stock-based compensation	450	373
Loss on disposal of property, plant and equipment	69	0
Other, net	(280)	(158)
Deferred income taxes	(809)	(406)
Changes in operating assets and liabilities	54	4,803
Net Cash Provided by Operating Activities	2,465	9,986
Cash flows from investing activities:
Purchase of property, plant and equipment	(1,130)	(611)
Purchase of marketable securities	(7)	(5,111)
Payment for acquisition	(2,687)	0
Proceeds from disposal of property, plant and equipment	2	0
Cash transferred from restricted cash	0	160
Net Cash Used in Investing Activities	(3,822)	(5,562)
Cash flows from financing activities:
Dividends paid to common shareholders	(782)	(778)
Net Cash Used In Financing Activities	(782)	(778)
Effect of exchange rate changes on cash	153	175
Net (Decrease) Increase in Cash and Cash Equivalents	(1,986)	3,821
Cash and Cash Equivalents - beginning of period	88,241	83,829
Cash and Cash Equivalents - end of period	86,255	87,650
Changes in operating assets and liabilities consist of:
Decrease in accounts receivable	1,831	9,063
Increase in inventories	(3,280)	(114)
Increase in prepaid expenses and other current assets	(695)	(261)
Decrease in other assets	(10)	0
Increase (decrease) in accounts payable	1,740	(3,530)
Decrease in accrued expenses	(763)	(3,426)
Cash payments of accrued restructuring costs	0	(40)
Increase in income taxes payable	1,231	3,111
Changes in operating assets and liabilities	54	4,803
Cash paid during the period for:
Income taxes, net of refunds received	235	(1,649)
Interest	0	0
Details of acquisition:
Fair value of identifiable net assets acquired	157	0
Goodwill	2,577	0
Fair value of net assets acquired	2,734	0
Fair value of consideration transferred	2,734	0
Deferred consideration	(47)	0
Cash paid for acquisition	$ 2,687	$ 0