Income Taxes (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Current deferred tax assets
State tax	$ 1,415,000	$ 1,133,000	$ 1,586,000
Workers' compensation	1,780,000	1,814,000	2,123,000
Health claims	601,000	516,000	549,000
Vacation liability	1,219,000	1,037,000	865,000
Allowance for doubtful accounts	181,000	332,000	291,000
Inventories	6,691,000	5,713,000	4,796,000
Sales incentive and advertising allowances	516,000	580,000	408,000
Intangible rights write-off			194,000
Acquisition expenses			477,000
Unrealized foreign exchange gain or loss	124,000	39,000	57,000
Other, net	172,000	309,000	428,000
Current deferred tax assets, net	12,699,000	11,473,000	11,774,000
Long-term deferred tax assets (liabilities)
Depreciation	(2,671,000)	(2,434,000)	(3,067,000)
Goodwill and other intangibles amortization	(9,781,000)	(4,086,000)	(314,000)
Deferred compensation related to stock options	6,104,000	7,296,000	5,485,000
Uncertain tax positions' unrecognized tax benefits	1,532,000	1,140,000	1,115,000
Non-United States tax loss carry forward	5,472,000	8,064,000	5,912,000
Tax effect on cumulative translation adjustment	(729,000)	(763,000)	(812,000)
Other	940,000	526,000	811,000
Long-term deferred tax assets (liabilities), gross	867,000	9,743,000	9,130,000
Less valuation allowances	(5,546,000)	(9,719,000)	(6,279,000)
Long-term deferred tax assets (liabilities), net	(4,679,000)	24,000	2,851,000
Deferred tax assets	22,000,000	21,600,000	21,400,000
Deferred tax liabilities	14,000,000	10,100,000	6,700,000
Operating loss carryforwards
Deferred tax valuation allowances	5,500,000	9,700,000
Increase (decrease) in the valuation allowance	(4,200,000)	3,400,000	(900,000)
Undistributed earnings indefinitely reinvested	34,800,000	29,000,000	20,900,000
Foreign
Operating loss carryforwards
Pre-tax loss carryforwards	23,600,000
Foreign | Wholly owned Irish subsidiary
Operating loss carryforwards
Pre-tax loss carryforwards	11,600,000
Foreign | Expiration, 2014
Operating loss carryforwards
Pre-tax loss carryforwards	900,000
Foreign | Expiration, 2015
Operating loss carryforwards
Pre-tax loss carryforwards	700,000
Foreign | Expiration, 2016
Operating loss carryforwards
Pre-tax loss carryforwards	800,000
Foreign | Expiration, 2017
Operating loss carryforwards
Pre-tax loss carryforwards	1,700,000
Foreign | Expiration, 2018
Operating loss carryforwards
Pre-tax loss carryforwards	$ 1,500,000