Line of Credit (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Line of Credit (Textual) [Abstract]
Total availability under line of credit agreement	$ 10.0
Letters of credit outstanding amount	0.6
Available borrowing under letter of credit	9.4
Varying Interest on Line of credit agreement	LIBOR plus 1.5% to prime
Line of credit interest rate	1.50%
Maturity date of line of credit	Jun. 30, 2014
Line of credit facility amount outstanding	$ 0	$ 0
Maximum ratio of total liabilities to tangible net worth	1
Minimum required fixed coverage charge ratio	1.25
Period used for calculating ratios	12 months
Company's tangible net worth ratio	0.34
Fixed coverage charge ratio	8.57