Significant Customers & Concentration of Credit Risk (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Single Automotive Customer [Member]
Concentration Risk [Line Items]
Maximum Concentration Risk Percentage	10.00%	10.00%
United States Government [Member] | Sales Revenue, Net [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	10.00%	10.00%
Automotive Industry [Member] | Sales Revenue, Net [Member]
Concentration Risk [Line Items]
Segment Concentration Risk Percentage	12.00%	15.00%
Financial And Insurance industry [Member] | Sales Revenue, Net [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	14.00%	9.00%
Single Financial Services Customer [Member] | Accounts Receivable [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	12.00%
Accounts Receivable, Net, Current	$ 15.8