Short-Term and Long-Term Debt (Details Textual) (USD $)			9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013 Revolving line of credit	Sep. 30, 2013 Revolving line of credit Minimum	Sep. 30, 2013 Revolving line of credit Float over LIBOR	Sep. 30, 2013 Revolving line of credit Fixed over LIBOR
Short-Term and Long-Term Debt (Textual) [Abstract]
Face amount	$ 4,750,000
Stated percentage	4.25%
Line of credit amount			30,000,000
Standby letter of credit			0
Interest rate on line of credit			interest rate on this line of credit can float at 2.50% over a selected LIBOR rate or can be fixed at 2.25% above LIBOR for a fixed rate term.
Interest rate on line of credit, margin					2.50%	2.25%
Credit facility maturity term			December 2013
Minimum net worth required for debt compliance				175,000,000
Tangible net worth			317,745,000
Liquid assets, debt covenant	$ 95,443,000	$ 90,753,000	$ 73,569,000	$ 25,000,000