Debt (Details) (USD $)	3 Months Ended		12 Months Ended	3 Months Ended		3 Months Ended			0 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Mar. 31, 2014 GE Credit Agreement [Member]	Dec. 31, 2013 GE Credit Agreement [Member]	Mar. 31, 2014 Minimum [Member] GE Credit Agreement [Member]	Mar. 31, 2014 Minimum [Member] LIBOR Rate [Member] GE Credit Agreement [Member]	Mar. 31, 2014 Minimum [Member] Base Rate [Member] GE Credit Agreement [Member]	Apr. 02, 2014 Amended [Member] Maximum [Member] GE Credit Agreement [Member]
Line of Credit Facility [Line Items]
Revolving credit facility, aggregate amount				$ 20,000,000
Revolving credit facility, restriction on cash and cash equivalents						5,000,000
Payment of cash dividends allowed per year, maximum				3,500,000
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
Common stock repurchase, authorized amount									14,000,000
Common stock repurchase, remaining authorized amount	13,500,000		13,500,000
Total interest expense	$ 61,000	$ 50,000