Income Taxes (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Current deferred tax assets
State tax	$ 1,133,000	$ 1,586,000	$ 1,197,000
Workers' compensation	1,814,000	2,123,000	1,816,000
Health claims	516,000	549,000	519,000
Vacation liability	1,037,000	865,000	786,000
Allowance for doubtful accounts	332,000	291,000	351,000
Inventories	5,713,000	4,796,000	5,141,000
Sales incentive and advertising allowances	580,000	408,000	399,000
State tax credit carry forward			125,000
Intangible rights write-off		194,000
Acquisition expenses		477,000
Unrealized foreign exchange gain or loss	39,000	57,000	86,000
Other, net	309,000	428,000	271,000
Current deferred tax assets, gross	11,473,000	11,774,000	10,691,000
Less valuation allowances			(502,000)
Current deferred tax assets, net	11,473,000	11,774,000	10,189,000
Long-term deferred tax assets (liabilities)
Depreciation	(2,434,000)	(3,067,000)	(1,614,000)
Goodwill and other intangibles amortization	(4,086,000)	(314,000)	(1,447,000)
Deferred compensation related to stock options	7,296,000	5,485,000	4,841,000
Uncertain tax positions' unrecognized tax benefits	1,140,000	1,115,000	1,438,000
Keymark investments basis difference			663,000
Non-United States tax loss carry forward	8,064,000	5,912,000	5,548,000
Tax effect on cumulative translation adjustment	(763,000)	(812,000)	(826,000)
Other	526,000	811,000	641,000
Long-term deferred tax assets, gross	9,743,000	9,130,000	9,244,000
Less valuation allowances	(9,719,000)	(6,279,000)	(6,665,000)
Long-term deferred tax assets	24,000	2,851,000	2,579,000
Deferred tax assets	21,600,000	21,400,000	19,200,000
Deferred tax liabilities	10,100,000	6,700,000	6,500,000
Operating loss carryforwards
Deferred tax valuation allowances	9,700,000	6,300,000
Increase (decrease) in the valuation allowance	3,400,000	(900,000)	2,300,000
Undistributed earnings indefinitely reinvested	29,000,000	20,900,000	14,600,000
Foreign
Operating loss carryforwards
Pre-tax loss carryforwards	41,000,000
Foreign | Wholly owned Irish subsidiary
Operating loss carryforwards
Pre-tax loss carryforwards	16,700,000
Foreign | Expiration, 2013
Operating loss carryforwards
Pre-tax loss carryforwards	900,000
Foreign | Expiration, 2014
Operating loss carryforwards
Pre-tax loss carryforwards	1,600,000
Foreign | Expiration, 2015
Operating loss carryforwards
Pre-tax loss carryforwards	800,000
Foreign | Expiration, 2016
Operating loss carryforwards
Pre-tax loss carryforwards	800,000
Foreign | Expiration, 2017
Operating loss carryforwards
Pre-tax loss carryforwards	$ 1,800,000