Debt (Details Textual) (USD $)	3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2013	Jan. 19, 2010
Line of Credit Facility [Line Items]
Revolving Credit facility commitment fee (percent)		0.50%
Minimum [Member]
Line of Credit Facility [Line Items]
Applicable margin (percent)	2.25%	2.25%
Maximum [Member]
Line of Credit Facility [Line Items]
Applicable margin (percent)	3.50%	3.50%
SunTrust Bank [Member]
Line of Credit Facility [Line Items]
Four-year revolving credit & Term Loan agreement	Jan. 19, 2010
Period of term loan and the revolving credit facility	4 years
Frequency of payment	Monthly
SunTrust term loan, Line of credit facility, frequency of payment	Quarterly
Index rate used as reference for interest rate on revolver and term loan	One-month LIBOR rate
Applicable margin (percent)	2.25%	2.25%
Revolving Credit facility and Term Loan interest rate (percent)	2.44%	2.44%
Mandatory principal payments on SunTrust term loan		$ 1,500,000
Sun Trust Term Loan [Member]
Line of Credit Facility [Line Items]
First payment on the term loan	Mar. 31, 2010
Committed revolving credit facility			15,000,000
Committed term loan			15,000,000
Term loan requires quarterly principal payments		800,000
Frequency of payment	Quarterly
Term loan final principal payment	3,000,000	3,000,000
Sun Trust Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Committed revolving credit facility	15,000,000	15,000,000
Revolving credit facility outstanding	$ 0	$ 0