Income Taxes (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Current deferred tax assets
State tax	$ 1,586,000	$ 1,197,000	$ 1,061,000
Workers' compensation	2,123,000	1,816,000	1,719,000
Health claims	549,000	519,000	391,000
Vacation liability	865,000	786,000	843,000
Allowance for doubtful accounts	291,000	351,000	1,614,000
Inventories	4,796,000	5,141,000	7,150,000
Sales incentive and advertising allowances	408,000	399,000	781,000
State tax credit carry forward		125,000	126,000
Accrued rent reserves			5,000
Intangible rights write-off	194,000
Acquisition expenses	477,000
Unrealized foreign exchange gain or loss	57,000	86,000	96,000
Other, net	428,000	271,000	549,000
Current deferred tax assets, gross	11,774,000	10,691,000	14,335,000
Less valuation allowances		(502,000)	(365,000)
Current deferred tax assets, net	11,774,000	10,189,000	13,970,000
Long-term deferred tax assets (liabilities)
Depreciation	(3,067,000)	(1,614,000)	259,000
Goodwill and other intangibles amortization	(314,000)	(1,447,000)	(3,704,000)
Deferred compensation related to stock options	5,485,000	4,841,000	6,562,000
Uncertain tax positions' unrecognized tax benefits	1,115,000	1,438,000	1,250,000
Keymark investments basis difference		663,000	447,000
Non-United States tax loss carry forward	5,912,000	5,548,000	5,011,000
Tax effect on cumulative translation adjustment	(812,000)	(826,000)	(799,000)
Other	811,000	641,000	1,095,000
Long-term deferred tax assets, gross	9,130,000	9,244,000	10,121,000
Less valuation allowances	(6,279,000)	(6,665,000)	(4,523,000)
Long-term deferred tax assets	2,851,000	2,579,000	5,598,000
Deferred tax assets	21,400,000	19,200,000	25,000,000
Deferred tax liabilities	6,700,000	6,500,000	5,500,000
Operating loss carryforwards
Deferred tax valuation allowances	6,300,000	7,200,000	4,900,000
Increase (decrease) in the valuation allowance	(900,000)	2,300,000	2,500,000
Undistributed earnings indefinitely reinvested	28,500,000	14,600,000	12,900,000
Foreign
Operating loss carryforwards
Tax loss carryforwards	29,500,000
Foreign | Expiration, 2013
Operating loss carryforwards
Tax loss carryforwards	900,000
Foreign | Expiration, 2014
Operating loss carryforwards
Tax loss carryforwards	2,900,000
Foreign | Expiration, 2015
Operating loss carryforwards
Tax loss carryforwards	700,000
Foreign | Expiration, 2016
Operating loss carryforwards
Tax loss carryforwards	$ 800,000