Debt (Details) (USD $)	12 Months Ended					12 Months Ended				0 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 GE Credit Agreement [Member]	Dec. 31, 2012 GE Credit Agreement [Member]	Dec. 31, 2013 Minimum [Member] GE Credit Agreement [Member]	Dec. 31, 2013 Minimum [Member] LIBOR Rate [Member] GE Credit Agreement [Member]	Dec. 31, 2013 Minimum [Member] Base Rate [Member] GE Credit Agreement [Member]	Oct. 28, 2011 Non-Amended [Member] GE Credit Agreement [Member]	May 23, 2013 Amended [Member] GE Credit Agreement [Member]	Oct. 28, 2011 Amended [Member] GE Credit Agreement [Member]
Line of Credit Facility [Line Items]
Revolving credit facility, aggregate amount									$ 15,000,000		$ 20,000,000
Payment of cash dividends allowed per year, maximum										3,500,000
Revolving credit facility, restriction on cash and cash equivalents						5,000,000
Revolving credit facility, liquidity requirement after effect to stock repurchase						20,000,000
Interest rate on amounts borrowed							4.25%	3.25%
Revolving credit facility, outstanding balance				0	0
Revolving credit facility, aggregate interest rate				6.50%	6.50%
Revolving credit facility, remaining availability				20,000,000	20,000,000
Total interest expense	$ 71,000	$ 179,000	$ 142,000