Debt (Details Textual)				1 Months Ended	12 Months Ended
	Dec. 23, 2014 USD ($) covenant	Jan. 17, 2014 USD ($)	Jan. 19, 2010 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Line of Credit Facility [Line Items]
Date of first required payment			Jan. 19, 2010
Description of variable rate basis					One-month LIBOR rate
SunTrust Bank [Member]
Line of Credit Facility [Line Items]
Period of term loan and the revolving credit facility			4 years
Revolving credit facility and term loan interest rate (percent)				2.43%			2.43%
Revolving credit facility commitment fee (percent)						0.50%
SunTrust Bank [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Applicable margin (percent)							2.25%
SunTrust Bank [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Applicable margin (percent)							3.50%
SunTrust Bank [Member] | LIBOR [Member]
Line of Credit Facility [Line Items]
Variable interest rate, term							1 month
Applicable margin (percent)						2.25%
Sun Trust Revolving Credit Facility [Member] | SunTrust Bank [Member]
Line of Credit Facility [Line Items]
Committed revolving credit facility	$ 20,000,000.0	$ 25,000,000	$ 15,000,000.0
Amount outstanding under credit facility					$ 0
Revolving credit facility commitment fee (percent)	0.25%	0.50%
Fixed interest rate (percent)		1.75%
Number of debt covenants | covenant	2
Term for debt covenants to apply (last days of fiscal quarter)	30 days
Future minimum principal payments					$ 0	$ 0
Sun Trust Revolving Credit Facility [Member] | SunTrust Bank [Member] | LIBOR [Member]
Line of Credit Facility [Line Items]
Applicable margin (percent)	1.75%
Interest rate at period end (percent)					1.99%
Sun Trust Term Loan [Member]
Line of Credit Facility [Line Items]
Date of first required payment					Mar. 31, 2010
Frequency of periodic payment					Quarterly
Sun Trust Term Loan [Member] | SunTrust Bank [Member]
Line of Credit Facility [Line Items]
Committed term loan			15,000,000.0
Revolving credit facility, quarterly principal payment			$ 800,000
Final principal payment				$ 3,000,000			$ 3,000,000
Term loan, weighted average interest rate (percent)				4.10%	0.25%	0.50%	4.10%
Mandatory principal payments on SunTrust term loan							$ 3,000,000