Income Taxes - Textual (Details) (USD $)	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010	Dec. 31, 2009
Operating Loss Carryforwards [Line Items]
Effective tax rate (ETR)	36.50%		37.60%		39.20%
Income Tax Reconciliation, Tax Exempt Income	$ 993,000		$ 495,000		$ 572,000
State and local taxes, return to provision adjustment	200,000
Amount of tax credits, research and development			300,000
Amount of tax credits, other			300,000
Change in valuation allowance related to federal tax credits	200,000
Income Tax Credits and Adjustments	300,000
Deferred tax assets, net operating losses	1,094,000		1,120,000
Deferred tax assets, valuation allowance	2,269,000		1,404,000		2,693,000	2,649,000
Deferred tax assets, operating losses, net of valuation	100,000
Valuation Allowance, deferred tax asset, change in amount	1,000,000	[1]	585,000	[2]	260,000
Unrecognized tax benefits	173,000		123,000		57,000
Unrecognized tax benefits, penalties and interest accrued	9,000
Common stock issued, non-qualified stock options (in shares)	461,000		465,000		101,000
Additional paid in capital, non-qualified stock options	2,200,000		1,600,000		200,000
Income taxes, net	6,500,000		4,600,000		4,800,000
Minimum
Operating Loss Carryforwards [Line Items]
Effective tax rate (ETR)	38.00%
Maximum
Operating Loss Carryforwards [Line Items]
Effective tax rate (ETR)	42.00%
State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	2,100,000
Deferred tax assets, net operating losses	100,000
State and Local Jurisdiction | Minimum
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, carryforward period	5 years
State and Local Jurisdiction | Maximum
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, carryforward period	20 years
NETHERLANDS
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	1,500,000
Deferred tax assets, net operating losses	400,000
Netherlands
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	2,800,000
Deferred tax assets, net operating losses	600,000
Life Insurance
Operating Loss Carryforwards [Line Items]
Income Tax Reconciliation, Tax Exempt Income	500,000
Valuation Allowance, Operating Loss Carryforwards [Member]
Operating Loss Carryforwards [Line Items]
Deferred tax assets, valuation allowance	1,000,000
NETHERLANDS
Operating Loss Carryforwards [Line Items]
Valuation Allowance, deferred tax asset, change in amount	$ 900,000

[1] These balances primarily reflect additions for an increase in the valuation reserve associated with certain deferred tax assets related to the Netherlands defined-benefit plan

[2] These balances primarily reflect additions for current year activity, deductions for the expiration of certain unused net operating losses, and additions and deductions for foreign currency translation