Income Taxes (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income Taxes [Abstract]
Income tax expense (benefit)	$ 1,352,000	$ 1,591,000	$ 3,750,000	$ 4,338,000
Earnings before income tax	4,024,000	4,156,000	11,355,000	11,196,000
Effective income tax rate (in hundredths)			33.00%	39.00%
Domestic Manufacturing Deduction			988,000
Unrecognized income tax benefits	1,074,000		1,074,000
Tax related interest expense			0
Tax related penalties expense			0
Tax Credit Carryforward [Line Items]
Research and development , tax credit	300,000		300,000
Ireland Tax Authority [Member]
Tax Credit Carryforward [Line Items]
Research and development , tax credit	$ 53,000		$ 53,000