Revolving Credit Facility Payable (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Jan. 27, 2006
Revolving Credit Facility [Member]
Line of Credit Facility, Amount Outstanding	$ 1.5	$ 15.0
Line of Credit Facility, Interest Rate During Period	2.78%
Debt Instrument, Description of Variable Rate Basis	prime rate or LIBOR plus 2.5%.
Debt Instrument, Basis Spread on Variable Rate	2.50%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.25%
Letter of Credit [Member]
Line of Credit Facility, Commitment Fee Percentage	1.00%